 @@ -1,1624 +1,1625 @@
-/*	$NetBSD: kern_rndq.c,v 1.60 2015/04/14 13:57:35 riastradh Exp $	*/
+/*	$NetBSD: kern_rndq.c,v 1.61 2015/04/14 14:11:51 riastradh Exp $	*/
 /*-
  * Copyright (c) 1997-2013 The NetBSD Foundation, Inc.
  * All rights reserved.
+ *
  * This code is derived from software contributed to The NetBSD Foundation
  * by Michael Graff <explorer@flame.org> and Thor Lancelot Simon.
  * This code uses ideas and algorithms from the Linux driver written by
  * Ted Ts'o.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
+ *
  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_rndq.c,v 1.60 2015/04/14 13:57:35 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_rndq.c,v 1.61 2015/04/14 14:11:51 riastradh Exp $");
 #include <sys/param.h>
 #include <sys/atomic.h>
 #include <sys/ioctl.h>
 #include <sys/fcntl.h>
 #include <sys/select.h>
 #include <sys/poll.h>
 #include <sys/kmem.h>
 #include <sys/mutex.h>
 #include <sys/proc.h>
 #include <sys/kernel.h>
 #include <sys/conf.h>
 #include <sys/systm.h>
 #include <sys/callout.h>
 #include <sys/intr.h>
 #include <sys/rnd.h>
 #include <sys/rndpool.h>
 #include <sys/rndsink.h>
 #include <sys/rndsource.h>
 #include <sys/vnode.h>
 #include <sys/pool.h>
 #include <sys/kauth.h>
 #include <sys/once.h>
 #include <sys/rngtest.h>
 #include <dev/rnd_private.h>
 #ifdef COMPAT_50
 #include <compat/sys/rnd.h>
 #endif
 #if defined(__HAVE_CPU_COUNTER)
 #include <machine/cpu_counter.h>
 #endif
 #ifdef RND_DEBUG
 #define	DPRINTF(l,x)      if (rnd_debug & (l)) rnd_printf x
 int	rnd_debug = 0;
 #else
 #define	DPRINTF(l,x)
 #endif
 /*
  * list devices attached
  */
 #if 0
 #define	RND_VERBOSE
 #endif
 #ifdef RND_VERBOSE
 #define	rnd_printf_verbose(fmt, ...)	rnd_printf(fmt, ##__VA_ARGS__)
 #else
 #define	rnd_printf_verbose(fmt, ...)	((void)0)
 #endif
 #ifdef RND_VERBOSE
 static unsigned int deltacnt;
 #endif
 /*
  * This is a little bit of state information attached to each device that we
  * collect entropy from.  This is simply a collection buffer, and when it
  * is full it will be "detached" from the source and added to the entropy
  * pool after entropy is distilled as much as possible.
  */
 #define	RND_SAMPLE_COUNT	64	/* collect N samples, then compress */
 typedef struct _rnd_sample_t {
 	SIMPLEQ_ENTRY(_rnd_sample_t) next;
 	krndsource_t	*source;
 	int		cursor;
 	int		entropy;
 	uint32_t	ts[RND_SAMPLE_COUNT];
 	uint32_t	values[RND_SAMPLE_COUNT];
 } rnd_sample_t;
 SIMPLEQ_HEAD(rnd_sampleq, _rnd_sample_t);
 /*
  * The sample queue.  Samples are put into the queue and processed in a
  * softint in order to limit the latency of adding a sample.
  */
 static struct {
 	kmutex_t		lock;
 	struct rnd_sampleq	q;
 } rnd_samples __cacheline_aligned;
 /*
  * Memory pool for sample buffers
  */
 static pool_cache_t rnd_mempc;
 /*
  * Global entropy pool and sources.
  */
 static struct {
 	kmutex_t		lock;
 	rndpool_t		pool;
 	LIST_HEAD(, krndsource)	sources;
 } rnd_global __cacheline_aligned;
 /*
  * This source is used to easily "remove" queue entries when the source
  * which actually generated the events is going away.
  */
 static krndsource_t rnd_source_no_collect = {
 	/* LIST_ENTRY list */
 	.name = { 'N', 'o', 'C', 'o', 'l', 'l', 'e', 'c', 't',
 , 0, 0, 0, 0, 0, 0 },
 	.total = 0,
 	.type = RND_TYPE_UNKNOWN,
 	.flags = (RND_FLAG_NO_COLLECT |
 		  RND_FLAG_NO_ESTIMATE),
 	.state = NULL,
 	.test_cnt = 0,
 	.test = NULL
 };
 krndsource_t rnd_printf_source, rnd_autoconf_source;
 static void *rnd_process, *rnd_wakeup;
 static        void	rnd_wakeup_readers(void);
 static inline uint32_t	rnd_counter(void);
 static        void	rnd_intr(void *);
 static	      void	rnd_wake(void *);
 static	      void	rnd_process_events(void);
 static	      void	rnd_add_data_ts(krndsource_t *, const void *const,
 					uint32_t, uint32_t, uint32_t);
 static inline void	rnd_schedule_process(void);
 int			rnd_ready = 0;
 int			rnd_initial_entropy = 0;
 static int		rnd_printing = 0;
 #ifdef DIAGNOSTIC
 static int		rnd_tested = 0;
 static rngtest_t	rnd_rt;
 static uint8_t		rnd_testbits[sizeof(rnd_rt.rt_b)];
 #endif
 static rndsave_t	*boot_rsp;
 static inline void
 rnd_printf(const char *fmt, ...)
+{
 	va_list ap;
 	membar_consumer();
 	if (rnd_printing) {
 		return;
+	}
 	rnd_printing = 1;
 	membar_producer();
 	va_start(ap, fmt);
 	vprintf(fmt, ap);
 	va_end(ap);
 	rnd_printing = 0;
+}
 void
 rnd_init_softint(void) {
 	rnd_process = softint_establish(SOFTINT_SERIAL|SOFTINT_MPSAFE,
 	    rnd_intr, NULL);
 	rnd_wakeup = softint_establish(SOFTINT_CLOCK|SOFTINT_MPSAFE,
 	    rnd_wake, NULL);
 	rnd_schedule_process();
+}
 /*
  * Generate a 32-bit counter.
  */
 static inline uint32_t
 rnd_counter(void)
+{
 	struct bintime bt;
 	uint32_t ret;
 #if defined(__HAVE_CPU_COUNTER)
 	if (cpu_hascounter())
 		return cpu_counter32();
 #endif
 	if (!rnd_ready)
 		/* Too early to call nanotime.  */
 		return 0;
 	binuptime(&bt);
 	ret = bt.sec;
 	ret |= bt.sec >> 32;
 	ret |= bt.frac;
 	ret |= bt.frac >> 32;
 	return ret;
+}
 /*
  * We may be called from low IPL -- protect our softint.
  */
 static inline void
 rnd_schedule_softint(void *softint)
+{
 	kpreempt_disable();
 	softint_schedule(softint);
 	kpreempt_enable();
+}
 static inline void
 rnd_schedule_process(void)
+{
 	if (__predict_true(rnd_process)) {
 		rnd_schedule_softint(rnd_process);
 		return;
+	}
 	rnd_process_events();
+}
 static inline void
 rnd_schedule_wakeup(void)
+{
 	if (__predict_true(rnd_wakeup)) {
 		rnd_schedule_softint(rnd_wakeup);
 		return;
+	}
 	rnd_wakeup_readers();
+}
 /*
  * Tell any sources with "feed me" callbacks that we are hungry.
  */
 void
 rnd_getmore(size_t byteswanted)
+{
 	krndsource_t *rs;
 	mutex_spin_enter(&rnd_global.lock);
 	LIST_FOREACH(rs, &rnd_global.sources, list) {
 		if (!ISSET(rs->flags, RND_FLAG_HASCB))
 			continue;
 		KASSERT(rs->get != NULL);
 		KASSERT(rs->getarg != NULL);
 		rs->get(byteswanted, rs->getarg);
 		rnd_printf_verbose("rnd: entropy estimate %zu bits\n",
 		    rndpool_get_entropy_count(&rnd_global.pool));
 		rnd_printf_verbose("rnd: asking source %s for %zu bytes\n",
 		    rs->name, byteswanted);
+	}
 	mutex_spin_exit(&rnd_global.lock);
+}
 /*
  * Check to see if there are readers waiting on us.  If so, kick them.
  */
 static void
 rnd_wakeup_readers(void)
+{
 	/*
 	 * XXX This bookkeeping shouldn't be here -- this is not where
 	 * the rnd_initial_entropy state change actually happens.
 	 */
 	mutex_spin_enter(&rnd_global.lock);
 	const size_t entropy_count = rndpool_get_entropy_count(&rnd_global.pool);
 	if (entropy_count < RND_ENTROPY_THRESHOLD * 8) {
 		mutex_spin_exit(&rnd_global.lock);
 		return;
 	} else {
 #ifdef RND_VERBOSE
 		if (__predict_false(!rnd_initial_entropy))
 			rnd_printf_verbose("rnd: have initial entropy (%zu)\n",
 			    entropy_count);
 #endif
 		rnd_initial_entropy = 1;
 	mutex_spin_exit(&rnd_global.lock);
 	rndsinks_distribute();
+}
 /*
  * Use the timing/value of the event to estimate the entropy gathered.
  * If all the differentials (first, second, and third) are non-zero, return
  * non-zero.  If any of these are zero, return zero.
  */
 static inline uint32_t
 rnd_delta_estimate(rnd_delta_t *d, uint32_t v, int32_t delta)
+{
 	int32_t delta2, delta3;
 	d->insamples++;
 	/*
 	 * Calculate the second and third order differentials
 	 */
 	delta2 = d->dx - delta;
 	if (delta2 < 0)
 		delta2 = -delta2;
 	delta3 = d->d2x - delta2;
 	if (delta3 < 0)
 		delta3 = -delta3;
 	d->x = v;
 	d->dx = delta;
 	d->d2x = delta2;
 	/*
 	 * If any delta is 0, we got no entropy.  If all are non-zero, we
 	 * might have something.
 	 */
 	if (delta == 0 || delta2 == 0 || delta3 == 0)
 		return (0);
 	d->outbits++;
 	return (1);
+}
 /*
  * Delta estimator for 32-bit timeestamps.  Must handle wrap.
  */
 static inline uint32_t
 rnd_dt_estimate(krndsource_t *rs, uint32_t t)
+{
 	int32_t delta;
 	uint32_t ret;
 	rnd_delta_t *d = &rs->time_delta;
 	if (t < d->x) {
 		delta = UINT32_MAX - d->x + t;
 	} else {
 		delta = d->x - t;
+	}
 	if (delta < 0) {
 		delta = -delta;
+	}
 	ret = rnd_delta_estimate(d, t, delta);
 	KASSERT(d->x == t);
 	KASSERT(d->dx == delta);
 #ifdef RND_VERBOSE
 	if (deltacnt++ % 1151 == 0) {
 		rnd_printf_verbose("rnd_dt_estimate: %s x = %lld, dx = %lld, "
 		       "d2x = %lld\n", rs->name,
 		       (int)d->x, (int)d->dx, (int)d->d2x);
+	}
 #endif
 	return ret;
+}
 /*
  * Delta estimator for 32 or bit values.  "Wrap" isn't.
  */
 static inline uint32_t
 rnd_dv_estimate(krndsource_t *rs, uint32_t v)
+{
 	int32_t delta;
 	uint32_t ret;
 	rnd_delta_t *d = &rs->value_delta;
 	delta = d->x - v;
 	if (delta < 0) {
 		delta = -delta;
+	}
 	ret = rnd_delta_estimate(d, v, (uint32_t)delta);
 	KASSERT(d->x == v);
 	KASSERT(d->dx == delta);
 #ifdef RND_VERBOSE
 	if (deltacnt++ % 1151 == 0) {
 		rnd_printf_verbose("rnd_dv_estimate: %s x = %lld, dx = %lld, "
 		       " d2x = %lld\n", rs->name,
 		       (long long int)d->x,
 		       (long long int)d->dx,
 		       (long long int)d->d2x);
+	}
 #endif
 	return ret;
+}
 #if defined(__HAVE_CPU_COUNTER)
 static struct {
 	kmutex_t	lock;
 	struct callout	callout;
 	struct callout	stop_callout;
 	krndsource_t	source;
 } rnd_skew __cacheline_aligned;
 static void rnd_skew_intr(void *);
 static void
 rnd_skew_enable(krndsource_t *rs, bool enabled)
+{
 	if (enabled) {
 		rnd_skew_intr(rs);
 	} else {
 		callout_stop(&rnd_skew.callout);
+	}
+}
 static void
 rnd_skew_stop_intr(void *arg)
+{
 	callout_stop(&rnd_skew.callout);
+}
 static void
 rnd_skew_get(size_t bytes, void *priv)
+{
 	krndsource_t *skewsrcp = priv;
 	KASSERT(skewsrcp == &rnd_skew.source);
 	if (RND_ENABLED(skewsrcp)) {
 		/* Measure for 30s */
 		callout_schedule(&rnd_skew.stop_callout, hz * 30);
 		callout_schedule(&rnd_skew.callout, 1);
+	}
+}
 static void
 rnd_skew_intr(void *arg)
+{
 	static int flipflop;
 	/*
 	 * Even on systems with seemingly stable clocks, the
 	 * delta-time entropy estimator seems to think we get 1 bit here
 	 * about every 2 calls.
+	 *
 	 */
 	mutex_spin_enter(&rnd_skew.lock);
 	flipflop = !flipflop;
 	if (RND_ENABLED(&rnd_skew.source)) {
 		if (flipflop) {
 			rnd_add_uint32(&rnd_skew.source, rnd_counter());
 			callout_schedule(&rnd_skew.callout, hz / 10);
 		} else {
 			callout_schedule(&rnd_skew.callout, 1);
+		}
+	}
 	mutex_spin_exit(&rnd_skew.lock);
+}
 #endif
 /*
  * Entropy was just added to the pool.  If we crossed the threshold for
  * the first time, set rnd_initial_entropy = 1.
  */
 static void
 rnd_entropy_added(void)
+{
 	uint32_t pool_entropy;
 	KASSERT(mutex_owned(&rnd_global.lock));
 	if (__predict_true(rnd_initial_entropy))
 		return;
 	pool_entropy = rndpool_get_entropy_count(&rnd_global.pool);
 	if (pool_entropy > RND_ENTROPY_THRESHOLD * NBBY) {
 		rnd_printf_verbose("rnd: have initial entropy (%zu)\n",
 		    pool_entropy);
 		rnd_initial_entropy = 1;
+	}
+}
 /*
  * initialize the global random pool for our use.
  * rnd_init() must be called very early on in the boot process, so
  * the pool is ready for other devices to attach as sources.
  */
 void
 rnd_init(void)
+{
 	uint32_t c;
 	if (rnd_ready)
 		return;
 	/*
 	 * take a counter early, hoping that there's some variance in
 	 * the following operations
 	 */
 	c = rnd_counter();
 	rndsinks_init();
 	/* Initialize the sample queue.  */
 	mutex_init(&rnd_samples.lock, MUTEX_DEFAULT, IPL_VM);
 	SIMPLEQ_INIT(&rnd_samples.q);
 	/* Initialize the global pool and sources list.  */
 	mutex_init(&rnd_global.lock, MUTEX_DEFAULT, IPL_VM);
 	rndpool_init(&rnd_global.pool);
 	LIST_INIT(&rnd_global.sources);
 	rnd_mempc = pool_cache_init(sizeof(rnd_sample_t), 0, 0, 0,
 				    "rndsample", NULL, IPL_VM,
 				    NULL, NULL, NULL);
 	/*
 	 * Set resource limit. The rnd_process_events() function
 	 * is called every tick and process the sample queue.
 	 * Without limitation, if a lot of rnd_add_*() are called,
 	 * all kernel memory may be eaten up.
 	 */
 	pool_cache_sethardlimit(rnd_mempc, RND_POOLBITS, NULL, 0);
 	/*
 	 * Mix *something*, *anything* into the pool to help it get started.
 	 * However, it's not safe for rnd_counter() to call microtime() yet,
 	 * so on some platforms we might just end up with zeros anyway.
 	 * XXX more things to add would be nice.
 	 */
 	if (c) {
 		mutex_spin_enter(&rnd_global.lock);
 		rndpool_add_data(&rnd_global.pool, &c, sizeof(c), 1);
 		c = rnd_counter();
 		rndpool_add_data(&rnd_global.pool, &c, sizeof(c), 1);
 		mutex_spin_exit(&rnd_global.lock);
+	}
 	/*
 	 * If we have a cycle counter, take its error with respect
 	 * to the callout mechanism as a source of entropy, ala
 	 * TrueRand.
+ 	 *
 	 */
 #if defined(__HAVE_CPU_COUNTER)
 	/* IPL_VM because taken while rnd_global.lock is held.  */
 	mutex_init(&rnd_skew.lock, MUTEX_DEFAULT, IPL_VM);
 	callout_init(&rnd_skew.callout, CALLOUT_MPSAFE);
 	callout_init(&rnd_skew.stop_callout, CALLOUT_MPSAFE);
 	callout_setfunc(&rnd_skew.callout, rnd_skew_intr, NULL);
 	callout_setfunc(&rnd_skew.stop_callout, rnd_skew_stop_intr, NULL);
 	rndsource_setcb(&rnd_skew.source, rnd_skew_get, &rnd_skew.source);
 	rndsource_setenable(&rnd_skew.source, rnd_skew_enable);
 	rnd_attach_source(&rnd_skew.source, "callout", RND_TYPE_SKEW,
 	    RND_FLAG_COLLECT_VALUE|RND_FLAG_ESTIMATE_VALUE|
 	    RND_FLAG_HASCB|RND_FLAG_HASENABLE);
 	rnd_skew_intr(NULL);
 #endif
 	rnd_printf_verbose("rnd: initialised (%u)%s", RND_POOLBITS,
 	    c ? " with counter\n" : "\n");
 	if (boot_rsp != NULL) {
 		mutex_spin_enter(&rnd_global.lock);
 		rndpool_add_data(&rnd_global.pool, boot_rsp->data,
 		    sizeof(boot_rsp->data),
 		    MIN(boot_rsp->entropy, RND_POOLBITS / 2));
-		if (rndpool_get_entropy_count(&rnd_global.pool) >
+		rnd_entropy_added();
-		    RND_ENTROPY_THRESHOLD * 8) {
+		mutex_spin_exit(&rnd_global.lock);
                 	rnd_initial_entropy = 1;
                 mutex_spin_exit(&rnd_global.lock);
 		rnd_printf("rnd: seeded with %d bits\n",
 		    MIN(boot_rsp->entropy, RND_POOLBITS / 2));
 		memset(boot_rsp, 0, sizeof(*boot_rsp));
+	}
 	rnd_attach_source(&rnd_printf_source, "printf", RND_TYPE_UNKNOWN,
 			  RND_FLAG_NO_ESTIMATE);
 	rnd_attach_source(&rnd_autoconf_source, "autoconf",
 			  RND_TYPE_UNKNOWN,
 			  RND_FLAG_COLLECT_TIME|RND_FLAG_ESTIMATE_TIME);
 	rnd_ready = 1;
+}
 static rnd_sample_t *
 rnd_sample_allocate(krndsource_t *source)
+{
 	rnd_sample_t *c;
 	c = pool_cache_get(rnd_mempc, PR_WAITOK);
 	if (c == NULL)
 		return (NULL);
 	c->source = source;
 	c->cursor = 0;
 	c->entropy = 0;
 	return (c);
+}
 /*
  * Don't wait on allocation.  To be used in an interrupt context.
  */
 static rnd_sample_t *
 rnd_sample_allocate_isr(krndsource_t *source)
+{
 	rnd_sample_t *c;
 	c = pool_cache_get(rnd_mempc, PR_NOWAIT);
 	if (c == NULL)
 		return (NULL);
 	c->source = source;
 	c->cursor = 0;
 	c->entropy = 0;
 	return (c);
+}
 static void
 rnd_sample_free(rnd_sample_t *c)
+{
 	memset(c, 0, sizeof(*c));
 	pool_cache_put(rnd_mempc, c);
+}
 /*
  * Add a source to our list of sources.
  */
 void
 rnd_attach_source(krndsource_t *rs, const char *name, uint32_t type,
     uint32_t flags)
+{
 	uint32_t ts;
 	ts = rnd_counter();
 	strlcpy(rs->name, name, sizeof(rs->name));
 	memset(&rs->time_delta, 0, sizeof(rs->time_delta));
 	rs->time_delta.x = ts;
 	memset(&rs->value_delta, 0, sizeof(rs->value_delta));
 	rs->total = 0;
 	/*
 	 * Some source setup, by type
 	 */
 	rs->test = NULL;
 	rs->test_cnt = -1;
 	if (flags == 0) {
 		flags = RND_FLAG_DEFAULT;
+	}
 	switch (type) {
 	    case RND_TYPE_NET:		/* Don't collect by default */
 		flags |= (RND_FLAG_NO_COLLECT | RND_FLAG_NO_ESTIMATE);
 		break;
 	    case RND_TYPE_RNG:		/* Space for statistical testing */
 		rs->test = kmem_alloc(sizeof(rngtest_t), KM_NOSLEEP);
 		rs->test_cnt = 0;
 		/* FALLTHRU */
 	    case RND_TYPE_VM:		/* Process samples in bulk always */
 		flags |= RND_FLAG_FAST;
 		break;
 	    default:
 		break;
+	}
 	rs->type = type;
 	rs->flags = flags;
 	rs->state = rnd_sample_allocate(rs);
 	mutex_spin_enter(&rnd_global.lock);
 	LIST_INSERT_HEAD(&rnd_global.sources, rs, list);
 #ifdef RND_VERBOSE
 	rnd_printf_verbose("rnd: %s attached as an entropy source (",
 	    rs->name);
 	if (!(flags & RND_FLAG_NO_COLLECT)) {
 		rnd_printf_verbose("collecting");
 		if (flags & RND_FLAG_NO_ESTIMATE)
 			rnd_printf_verbose(" without estimation");
+	}
 	else
 		rnd_printf_verbose("off");
 	rnd_printf_verbose(")\n");
 #endif
 	/*
 	 * Again, put some more initial junk in the pool.
 	 * FreeBSD claim to have an analysis that show 4 bits of
 	 * entropy per source-attach timestamp.  I am skeptical,
 	 * but we count 1 bit per source here.
 	 */
 	rndpool_add_data(&rnd_global.pool, &ts, sizeof(ts), 1);
 	mutex_spin_exit(&rnd_global.lock);
+}
 /*
  * Remove a source from our list of sources.
  */
 void
 rnd_detach_source(krndsource_t *source)
+{
 	rnd_sample_t *sample;
 	mutex_spin_enter(&rnd_global.lock);
 	LIST_REMOVE(source, list);
 	mutex_spin_exit(&rnd_global.lock);
 	/*
 	 * If there are samples queued up "remove" them from the sample queue
 	 * by setting the source to the no-collect pseudosource.
 	 */
 	mutex_spin_enter(&rnd_samples.lock);
 	sample = SIMPLEQ_FIRST(&rnd_samples.q);
 	while (sample != NULL) {
 		if (sample->source == source)
 			sample->source = &rnd_source_no_collect;
 		sample = SIMPLEQ_NEXT(sample, next);
+	}
 	mutex_spin_exit(&rnd_samples.lock);
 	if (source->state) {
 		rnd_sample_free(source->state);
 		source->state = NULL;
+	}
 	if (source->test) {
 		kmem_free(source->test, sizeof(rngtest_t));
+	}
 	rnd_printf_verbose("rnd: %s detached as an entropy source\n",
 	    source->name);
+}
 static inline uint32_t
 rnd_estimate(krndsource_t *rs, uint32_t ts, uint32_t val)
+{
 	uint32_t entropy = 0, dt_est, dv_est;
 	dt_est = rnd_dt_estimate(rs, ts);
 	dv_est = rnd_dv_estimate(rs, val);
 	if (!(rs->flags & RND_FLAG_NO_ESTIMATE)) {
 		if (rs->flags & RND_FLAG_ESTIMATE_TIME) {
 			entropy += dt_est;
+		}
                 if (rs->flags & RND_FLAG_ESTIMATE_VALUE) {
 			entropy += dv_est;
+		}
+	}
 	return entropy;
+}
 /*
  * Add a 32-bit value to the entropy pool.  The rs parameter should point to
  * the source-specific source structure.
  */
 void
 _rnd_add_uint32(krndsource_t *rs, uint32_t val)
+{
 	uint32_t ts;
 	uint32_t entropy = 0;
 	if (rs->flags & RND_FLAG_NO_COLLECT)
 		return;
 	/*
 	 * Sample the counter as soon as possible to avoid
 	 * entropy overestimation.
 	 */
 	ts = rnd_counter();
 	/*
 	 * Calculate estimates - we may not use them, but if we do
 	 * not calculate them, the estimators' history becomes invalid.
 	 */
 	entropy = rnd_estimate(rs, ts, val);
 	rnd_add_data_ts(rs, &val, sizeof(val), entropy, ts);
+}
 void
 _rnd_add_uint64(krndsource_t *rs, uint64_t val)
+{
 	uint32_t ts;
 	uint32_t entropy = 0;
 	if (rs->flags & RND_FLAG_NO_COLLECT)
                 return;
 	/*
 	 * Sample the counter as soon as possible to avoid
 	 * entropy overestimation.
 	 */
 	ts = rnd_counter();
 	/*
 	 * Calculate estimates - we may not use them, but if we do
 	 * not calculate them, the estimators' history becomes invalid.
 	 */
 	entropy = rnd_estimate(rs, ts, (uint32_t)(val & (uint64_t)0xffffffff));
 	rnd_add_data_ts(rs, &val, sizeof(val), entropy, ts);
+}
 void
 rnd_add_data(krndsource_t *rs, const void *const data, uint32_t len,
 	     uint32_t entropy)
+{
 	/*
 	 * This interface is meant for feeding data which is,
 	 * itself, random.  Don't estimate entropy based on
 	 * timestamp, just directly add the data.
 	 */
 	if (__predict_false(rs == NULL)) {
 		mutex_spin_enter(&rnd_global.lock);
 		rndpool_add_data(&rnd_global.pool, data, len, entropy);
 		mutex_spin_exit(&rnd_global.lock);
 	} else {
 		rnd_add_data_ts(rs, data, len, entropy, rnd_counter());
+	}
+}
 static void
 rnd_add_data_ts(krndsource_t *rs, const void *const data, uint32_t len,
     uint32_t entropy, uint32_t ts)
+{
 	rnd_sample_t *state = NULL;
 	const uint8_t *p = data;
 	uint32_t dint;
 	int todo, done, filled = 0;
 	int sample_count;
 	struct rnd_sampleq tmp_samples = SIMPLEQ_HEAD_INITIALIZER(tmp_samples);
 	if (rs && (rs->flags & RND_FLAG_NO_COLLECT ||
 	    __predict_false(!(rs->flags &
 			     (RND_FLAG_COLLECT_TIME|
 			     RND_FLAG_COLLECT_VALUE))))) {
 		return;
+	}
 	todo = len / sizeof(dint);
 	/*
 	 * Let's try to be efficient: if we are warm, and a source
 	 * is adding entropy at a rate of at least 1 bit every 10 seconds,
 	 * mark it as "fast" and add its samples in bulk.
 	 */
 	if (__predict_true(rs->flags & RND_FLAG_FAST) ||
 	    (todo >= RND_SAMPLE_COUNT)) {
 		sample_count = RND_SAMPLE_COUNT;
 	} else {
 		if (!(rs->flags & RND_FLAG_HASCB) &&
 		    !cold && rnd_initial_entropy) {
 			struct timeval upt;
 			getmicrouptime(&upt);
 			if ( (upt.tv_sec > 0  && rs->total > upt.tv_sec * 10) ||
 			    (upt.tv_sec > 10 && rs->total > upt.tv_sec) ||
 			    (upt.tv_sec > 100 &&
 			      rs->total > upt.tv_sec / 10)) {
 				rnd_printf_verbose("rnd: source %s is fast"
 				    " (%d samples at once,"
 				    " %d bits in %lld seconds), "
 				    "processing samples in bulk.\n",
 				    rs->name, todo, rs->total,
 				    (long long int)upt.tv_sec);
 				rs->flags |= RND_FLAG_FAST;
+			}
+		}
 		sample_count = 2;
+	}
 	/*
 	 * Loop over data packaging it into sample buffers.
 	 * If a sample buffer allocation fails, drop all data.
 	 */
 	for (done = 0; done < todo ; done++) {
 		state = rs->state;
 		if (state == NULL) {
 			state = rnd_sample_allocate_isr(rs);
 			if (__predict_false(state == NULL)) {
 				break;
+			}
 			rs->state = state;
+		}
 		state->ts[state->cursor] = ts;
 		(void)memcpy(&dint, &p[done*4], 4);
 		state->values[state->cursor] = dint;
 		state->cursor++;
 		if (state->cursor == sample_count) {
 			SIMPLEQ_INSERT_HEAD(&tmp_samples, state, next);
 			filled++;
 			rs->state = NULL;
+		}
+	}
 	if (__predict_false(state == NULL)) {
 		while ((state = SIMPLEQ_FIRST(&tmp_samples))) {
 			SIMPLEQ_REMOVE_HEAD(&tmp_samples, next);
 			rnd_sample_free(state);
+		}
 		return;
+	}
 	/*
 	 * Claim all the entropy on the last one we send to
 	 * the pool, so we don't rely on it being evenly distributed
 	 * in the supplied data.
+	 *
 	 * XXX The rndpool code must accept samples with more
 	 * XXX claimed entropy than bits for this to work right.
 	 */
 	state->entropy += entropy;
 	rs->total += entropy;
 	/*
 	 * If we didn't finish any sample buffers, we're done.
 	 */
 	if (!filled) {
 		return;
+	}
 	mutex_spin_enter(&rnd_samples.lock);
 	while ((state = SIMPLEQ_FIRST(&tmp_samples))) {
 		SIMPLEQ_REMOVE_HEAD(&tmp_samples, next);
 		SIMPLEQ_INSERT_HEAD(&rnd_samples.q, state, next);
+	}
 	mutex_spin_exit(&rnd_samples.lock);
 	/* Cause processing of queued samples */
 	rnd_schedule_process();
+}
 static int
 rnd_hwrng_test(rnd_sample_t *sample)
+{
 	krndsource_t *source = sample->source;
 	size_t cmplen;
 	uint8_t *v1, *v2;
 	size_t resid, totest;
 	KASSERT(source->type == RND_TYPE_RNG);
 	/*
 	 * Continuous-output test: compare two halves of the
 	 * sample buffer to each other.  The sample buffer (64 ints,
 	 * so either 256 or 512 bytes on any modern machine) should be
 	 * much larger than a typical hardware RNG output, so this seems
 	 * a reasonable way to do it without retaining extra data.
 	 */
 	cmplen = sizeof(sample->values) / 2;
 	v1 = (uint8_t *)sample->values;
 	v2 = (uint8_t *)sample->values + cmplen;
 	if (__predict_false(!memcmp(v1, v2, cmplen))) {
 		rnd_printf("rnd: source \"%s\" failed continuous-output test.\n",
 		       source->name);
 		return 1;
+	}
 	/*
 	 * FIPS 140 statistical RNG test.  We must accumulate 20,000 bits.
 	 */
 	if (__predict_true(source->test_cnt == -1)) {
 		/* already passed the test */
 		return 0;
+	}
 	resid = FIPS140_RNG_TEST_BYTES - source->test_cnt;
 	totest = MIN(RND_SAMPLE_COUNT * 4, resid);
 	memcpy(source->test->rt_b + source->test_cnt, sample->values, totest);
 	resid -= totest;
 	source->test_cnt += totest;
 	if (resid == 0) {
 		strlcpy(source->test->rt_name, source->name,
 			sizeof(source->test->rt_name));
 		if (rngtest(source->test)) {
 			rnd_printf("rnd: source \"%s\" failed statistical test.",
 			       source->name);
 			return 1;
+		}
 		source->test_cnt = -1;
 		memset(source->test, 0, sizeof(*source->test));
+	}
 	return 0;
+}
 /*
  * Process the events in the ring buffer.  Called by rnd_timeout or
  * by the add routines directly if the callout has never fired (that
  * is, if we are "cold" -- just booted).
+ *
  */
 static void
 rnd_process_events(void)
+{
 	rnd_sample_t *sample = NULL;
 	krndsource_t *source;
 	static krndsource_t *last_source;
 	uint32_t entropy;
 	size_t pool_entropy;
 	int found = 0, wake = 0;
 	struct rnd_sampleq dq_samples = SIMPLEQ_HEAD_INITIALIZER(dq_samples);
 	struct rnd_sampleq df_samples = SIMPLEQ_HEAD_INITIALIZER(df_samples);
 	/*
 	 * Drain to the on-stack queue and drop the lock.
 	 */
 	mutex_spin_enter(&rnd_samples.lock);
 	while ((sample = SIMPLEQ_FIRST(&rnd_samples.q))) {
 		found++;
 		SIMPLEQ_REMOVE_HEAD(&rnd_samples.q, next);
 		/*
 		 * We repeat this check here, since it is possible
 		 * the source was disabled before we were called, but
 		 * after the entry was queued.
 		 */
 		if (__predict_false(!(sample->source->flags &
 				    (RND_FLAG_COLLECT_TIME|
 				     RND_FLAG_COLLECT_VALUE)))) {
 			SIMPLEQ_INSERT_TAIL(&df_samples, sample, next);
 		} else {
 			SIMPLEQ_INSERT_TAIL(&dq_samples, sample, next);
+		}
+	}
 	mutex_spin_exit(&rnd_samples.lock);
 	/* Don't thrash the rndpool mtx either.  Hold, add all samples. */
 	mutex_spin_enter(&rnd_global.lock);
 	pool_entropy = rndpool_get_entropy_count(&rnd_global.pool);
 	while ((sample = SIMPLEQ_FIRST(&dq_samples))) {
 		int sample_count;
 		SIMPLEQ_REMOVE_HEAD(&dq_samples, next);
 		source = sample->source;
 		entropy = sample->entropy;
 		sample_count = sample->cursor;
 		/*
 		 * Don't provide a side channel for timing attacks on
 		 * low-rate sources: require mixing with some other
 		 * source before we schedule a wakeup.
 		 */
 		if (!wake &&
 		    (source != last_source || source->flags & RND_FLAG_FAST)) {
 			wake++;
+		}
 		last_source = source;
 		/*
 		 * If the source has been disabled, ignore samples from
 		 * it.
 		 */
 		if (source->flags & RND_FLAG_NO_COLLECT)
 			goto skip;
 		/*
 		 * Hardware generators are great but sometimes they
 		 * have...hardware issues.  Don't use any data from
 		 * them unless it passes some tests.
 		 */
 		if (source->type == RND_TYPE_RNG) {
 			if (__predict_false(rnd_hwrng_test(sample))) {
 				source->flags |= RND_FLAG_NO_COLLECT;
 				rnd_printf("rnd: disabling source \"%s\".",
 				    source->name);
 				goto skip;
+			}
+		}
 		if (source->flags & RND_FLAG_COLLECT_VALUE) {
 			rndpool_add_data(&rnd_global.pool, sample->values,
 					 sample_count *
 					     sizeof(sample->values[1]),
 );
+		}
 		if (source->flags & RND_FLAG_COLLECT_TIME) {
 			rndpool_add_data(&rnd_global.pool, sample->ts,
 					 sample_count *
 					     sizeof(sample->ts[1]),
 );
+		}
 		pool_entropy += entropy;
 		source->total += sample->entropy;
 skip:		SIMPLEQ_INSERT_TAIL(&df_samples, sample, next);
+	}
 	rndpool_set_entropy_count(&rnd_global.pool, pool_entropy);
 	rnd_entropy_added();
 	mutex_spin_exit(&rnd_global.lock);
 	/*
 	 * If we filled the pool past the threshold, wake anyone
 	 * waiting for entropy.  Otherwise, ask all the entropy sources
 	 * for more.
 	 */
 	if (pool_entropy > RND_ENTROPY_THRESHOLD * 8) {
 		wake++;
 	} else {
 		rnd_getmore(howmany((RND_POOLBITS - pool_entropy), NBBY));
 		rnd_printf_verbose("rnd: empty, asking for %d bytes\n",
 		    (int)(howmany((RND_POOLBITS - pool_entropy), NBBY)));
+	}
 	/* Now we hold no locks: clean up. */
 	while ((sample = SIMPLEQ_FIRST(&df_samples))) {
 		SIMPLEQ_REMOVE_HEAD(&df_samples, next);
 		rnd_sample_free(sample);
+	}
 	/*
 	 * Wake up any potential readers waiting.
 	 */
 	if (wake) {
 		rnd_schedule_wakeup();
+	}
+}
 static void
 rnd_intr(void *arg)
+{
 	rnd_process_events();
+}
 static void
 rnd_wake(void *arg)
+{
 	rnd_wakeup_readers();
+}
 static uint32_t
 rnd_extract_data(void *p, uint32_t len, uint32_t flags)
+{
 	static int timed_in;
 	int entropy_count;
 	uint32_t retval;
 	mutex_spin_enter(&rnd_global.lock);
 	if (__predict_false(!timed_in)) {
 		if (boottime.tv_sec) {
 			rndpool_add_data(&rnd_global.pool, &boottime,
 					 sizeof(boottime), 0);
+		}
 		timed_in++;
+	}
 	if (__predict_false(!rnd_initial_entropy)) {
 		uint32_t c;
 		rnd_printf_verbose("rnd: WARNING! initial entropy low (%u).\n",
 		       rndpool_get_entropy_count(&rnd_global.pool));
 		/* Try once again to put something in the pool */
 		c = rnd_counter();
 		rndpool_add_data(&rnd_global.pool, &c, sizeof(c), 1);
+	}
 #ifdef DIAGNOSTIC
 	while (!rnd_tested) {
 		entropy_count = rndpool_get_entropy_count(&rnd_global.pool);
 		rnd_printf_verbose("rnd: starting statistical RNG test,"
 		    " entropy = %d.\n",
 		    entropy_count);
 		if (rndpool_extract_data(&rnd_global.pool, rnd_rt.rt_b,
 		    sizeof(rnd_rt.rt_b), RND_EXTRACT_ANY)
 		    != sizeof(rnd_rt.rt_b)) {
 			panic("rnd: could not get bits for statistical test");
+		}
 		/*
 		 * Stash the tested bits so we can put them back in the
 		 * pool, restoring the entropy count.  DO NOT rely on
 		 * rngtest to maintain the bits pristine -- we could end
 		 * up adding back non-random data claiming it were pure
 		 * entropy.
 		 */
 		memcpy(rnd_testbits, rnd_rt.rt_b, sizeof(rnd_rt.rt_b));
 		strlcpy(rnd_rt.rt_name, "entropy pool", sizeof(rnd_rt.rt_name));
 		if (rngtest(&rnd_rt)) {
 			/*
 			 * The probabiliity of a Type I error is 3/10000,
 			 * but note this can only happen at boot time.
 			 * The relevant standard says to reset the module,
 			 * but developers objected...
 			 */
 			rnd_printf("rnd: WARNING, ENTROPY POOL FAILED "
 			       "STATISTICAL TEST!\n");
 			continue;
+		}
 		memset(&rnd_rt, 0, sizeof(rnd_rt));
 		rndpool_add_data(&rnd_global.pool, rnd_testbits,
 		    sizeof(rnd_testbits), entropy_count);
 		memset(rnd_testbits, 0, sizeof(rnd_testbits));
 		rnd_printf_verbose("rnd: statistical RNG test done,"
 		    " entropy = %d.\n",
 		    rndpool_get_entropy_count(&rnd_global.pool));
 		rnd_tested++;
+	}
 #endif
 	entropy_count = rndpool_get_entropy_count(&rnd_global.pool);
 	retval = rndpool_extract_data(&rnd_global.pool, p, len, flags);
 	mutex_spin_exit(&rnd_global.lock);
 	if (entropy_count < (RND_ENTROPY_THRESHOLD * 2 + len) * NBBY) {
 		rnd_printf_verbose("rnd: empty, asking for %d bytes\n",
 		    (int)(howmany((RND_POOLBITS - entropy_count), NBBY)));
 		rnd_getmore(howmany((RND_POOLBITS - entropy_count), NBBY));
+	}
 	return retval;
+}
 /*
  * Fill the buffer with as much entropy as we can.  Return true if it
  * has full entropy and false if not.
  */
 bool
 rnd_extract(void *buffer, size_t bytes)
+{
 	const size_t extracted = rnd_extract_data(buffer, bytes,
 	    RND_EXTRACT_GOOD);
 	if (extracted < bytes) {
 		rnd_getmore(bytes - extracted);
 		(void)rnd_extract_data((uint8_t *)buffer + extracted,
 		    bytes - extracted, RND_EXTRACT_ANY);
 		return false;
+	}
 	return true;
+}
 /*
  * If we have as much entropy as is requested, fill the buffer with it
  * and return true.  Otherwise, leave the buffer alone and return
  * false.
  */
 CTASSERT(RND_ENTROPY_THRESHOLD <= 0xffffffffUL);
 CTASSERT(RNDSINK_MAX_BYTES <= (0xffffffffUL - RND_ENTROPY_THRESHOLD));
 CTASSERT((RNDSINK_MAX_BYTES + RND_ENTROPY_THRESHOLD) <=
 	    (0xffffffffUL / NBBY));
 bool
 rnd_tryextract(void *buffer, size_t bytes)
+{
 	uint32_t bits_needed, bytes_requested;
 	KASSERT(bytes <= RNDSINK_MAX_BYTES);
 	bits_needed = ((bytes + RND_ENTROPY_THRESHOLD) * NBBY);
 	mutex_spin_enter(&rnd_global.lock);
 	if (bits_needed <= rndpool_get_entropy_count(&rnd_global.pool)) {
 		const uint32_t extracted __diagused =
 		    rndpool_extract_data(&rnd_global.pool, buffer, bytes,
 			RND_EXTRACT_GOOD);
 		KASSERT(extracted == bytes);
 		bytes_requested = 0;
 	} else {
 		/* XXX Figure the threshold into this...  */
 		bytes_requested = howmany((bits_needed -
 			rndpool_get_entropy_count(&rnd_global.pool)), NBBY);
 		KASSERT(0 < bytes_requested);
+	}
 	mutex_spin_exit(&rnd_global.lock);
 	if (0 < bytes_requested)
 		rnd_getmore(bytes_requested);
 	return bytes_requested == 0;
+}
 void
 rnd_seed(void *base, size_t len)
+{
 	SHA1_CTX s;
 	uint8_t digest[SHA1_DIGEST_LENGTH];
 	if (len != sizeof(*boot_rsp)) {
 		rnd_printf("rnd: bad seed length %d\n", (int)len);
 		return;
+	}
 	boot_rsp = (rndsave_t *)base;
 	SHA1Init(&s);
 	SHA1Update(&s, (uint8_t *)&boot_rsp->entropy,
 		   sizeof(boot_rsp->entropy));
 	SHA1Update(&s, boot_rsp->data, sizeof(boot_rsp->data));
 	SHA1Final(digest, &s);
 	if (memcmp(digest, boot_rsp->digest, sizeof(digest))) {
 		rnd_printf("rnd: bad seed checksum\n");
 		return;
+	}
 	/*
 	 * It's not really well-defined whether bootloader-supplied
 	 * modules run before or after rnd_init().  Handle both cases.
 	 */
 	if (rnd_ready) {
 		rnd_printf_verbose("rnd: ready,"
 		    " feeding in seed data directly.\n");
 		mutex_spin_enter(&rnd_global.lock);
 		rndpool_add_data(&rnd_global.pool, boot_rsp->data,
 				 sizeof(boot_rsp->data),
 				 MIN(boot_rsp->entropy, RND_POOLBITS / 2));
 		memset(boot_rsp, 0, sizeof(*boot_rsp));
 		mutex_spin_exit(&rnd_global.lock);
 	} else {
 		rnd_printf_verbose("rnd: not ready, deferring seed feed.\n");
+	}
+}
 static void
 krndsource_to_rndsource(krndsource_t *kr, rndsource_t *r)
+{
 	memset(r, 0, sizeof(*r));
 	strlcpy(r->name, kr->name, sizeof(r->name));
         r->total = kr->total;
         r->type = kr->type;
         r->flags = kr->flags;
+}
 static void
 krndsource_to_rndsource_est(krndsource_t *kr, rndsource_est_t *re)
+{
 	memset(re, 0, sizeof(*re));
 	krndsource_to_rndsource(kr, &re->rt);
 	re->dt_samples = kr->time_delta.insamples;
 	re->dt_total = kr->time_delta.outbits;
 	re->dv_samples = kr->value_delta.insamples;
 	re->dv_total = kr->value_delta.outbits;
+}
 static void
 krs_setflags(krndsource_t *kr, uint32_t flags, uint32_t mask)
+{
 	uint32_t oflags = kr->flags;
 	kr->flags &= ~mask;
 	kr->flags |= (flags & mask);
 	if (oflags & RND_FLAG_HASENABLE &&
             ((oflags & RND_FLAG_NO_COLLECT) != (flags & RND_FLAG_NO_COLLECT))) {
 		kr->enable(kr, !(flags & RND_FLAG_NO_COLLECT));
+	}
+}
 int
 rnd_system_ioctl(struct file *fp, u_long cmd, void *addr)
+{
 	krndsource_t *kr;
 	rndstat_t *rst;
 	rndstat_name_t *rstnm;
 	rndstat_est_t *rset;
 	rndstat_est_name_t *rsetnm;
 	rndctl_t *rctl;
 	rnddata_t *rnddata;
 	uint32_t count, start;
 	int ret = 0;
 	int estimate_ok = 0, estimate = 0;
 	switch (cmd) {
 	case RNDGETENTCNT:
 		break;
 	case RNDGETPOOLSTAT:
 	case RNDGETSRCNUM:
 	case RNDGETSRCNAME:
 	case RNDGETESTNUM:
 	case RNDGETESTNAME:
 		ret = kauth_authorize_device(curlwp->l_cred,
 		    KAUTH_DEVICE_RND_GETPRIV, NULL, NULL, NULL, NULL);
 		if (ret)
 			return (ret);
 		break;
 	case RNDCTL:
 		ret = kauth_authorize_device(curlwp->l_cred,
 		    KAUTH_DEVICE_RND_SETPRIV, NULL, NULL, NULL, NULL);
 		if (ret)
 			return (ret);
 		break;
 	case RNDADDDATA:
 		ret = kauth_authorize_device(curlwp->l_cred,
 		    KAUTH_DEVICE_RND_ADDDATA, NULL, NULL, NULL, NULL);
 		if (ret)
 			return (ret);
 		estimate_ok = !kauth_authorize_device(curlwp->l_cred,
 		    KAUTH_DEVICE_RND_ADDDATA_ESTIMATE, NULL, NULL, NULL, NULL);
 		break;
 	default:
 #ifdef COMPAT_50
 		return compat_50_rnd_ioctl(fp, cmd, addr);
 #else
 		return ENOTTY;
 #endif
+	}
 	switch (cmd) {
 	case RNDGETENTCNT:
 		mutex_spin_enter(&rnd_global.lock);
 		*(uint32_t *)addr = rndpool_get_entropy_count(&rnd_global.pool);
 		mutex_spin_exit(&rnd_global.lock);
 		break;
 	case RNDGETPOOLSTAT:
 		mutex_spin_enter(&rnd_global.lock);
 		rndpool_get_stats(&rnd_global.pool, addr,
 		    sizeof(rndpoolstat_t));
 		mutex_spin_exit(&rnd_global.lock);
 		break;
 	case RNDGETSRCNUM:
 		rst = (rndstat_t *)addr;
 		if (rst->count == 0)
 			break;
 		if (rst->count > RND_MAXSTATCOUNT)
 			return (EINVAL);
 		mutex_spin_enter(&rnd_global.lock);
 		/*
 		 * Find the starting source by running through the
 		 * list of sources.
 		 */
 		kr = LIST_FIRST(&rnd_global.sources);
 		start = rst->start;
 		while (kr != NULL && start >= 1) {
 			kr = LIST_NEXT(kr, list);
 			start--;
+		}
 		/*
 		 * Return up to as many structures as the user asked
 		 * for.  If we run out of sources, a count of zero
 		 * will be returned, without an error.
 		 */
 		for (count = 0; count < rst->count && kr != NULL; count++) {
 			krndsource_to_rndsource(kr, &rst->source[count]);
 			kr = LIST_NEXT(kr, list);
+		}
 		rst->count = count;
 		mutex_spin_exit(&rnd_global.lock);
 		break;
 	case RNDGETESTNUM:
 		rset = (rndstat_est_t *)addr;
 		if (rset->count == 0)
 			break;
 		if (rset->count > RND_MAXSTATCOUNT)
 			return (EINVAL);
 		mutex_spin_enter(&rnd_global.lock);
 		/*
 		 * Find the starting source by running through the
 		 * list of sources.
 		 */
 		kr = LIST_FIRST(&rnd_global.sources);
 		start = rset->start;
 		while (kr != NULL && start > 1) {
 			kr = LIST_NEXT(kr, list);
 			start--;
+		}
 		/* Return up to as many structures as the user asked
 		 * for.  If we run out of sources, a count of zero
 		 * will be returned, without an error.
 		 */
 		for (count = 0; count < rset->count && kr != NULL; count++) {
 			krndsource_to_rndsource_est(kr, &rset->source[count]);
 			kr = LIST_NEXT(kr, list);
+		}
 		rset->count = count;
 		mutex_spin_exit(&rnd_global.lock);
 		break;
 	case RNDGETSRCNAME:
 		/*
 		 * Scan through the list, trying to find the name.
 		 */
 		mutex_spin_enter(&rnd_global.lock);
 		rstnm = (rndstat_name_t *)addr;
 		kr = LIST_FIRST(&rnd_global.sources);
 		while (kr != NULL) {
 			if (strncmp(kr->name, rstnm->name,
 				    MIN(sizeof(kr->name),
 					sizeof(rstnm->name))) == 0) {
 				krndsource_to_rndsource(kr, &rstnm->source);
 				mutex_spin_exit(&rnd_global.lock);
 				return (0);
+			}
 			kr = LIST_NEXT(kr, list);
+		}
 		mutex_spin_exit(&rnd_global.lock);
 		ret = ENOENT;		/* name not found */
 		break;
 	case RNDGETESTNAME:
 		/*
 		 * Scan through the list, trying to find the name.
 		 */
 		mutex_spin_enter(&rnd_global.lock);
 		rsetnm = (rndstat_est_name_t *)addr;
 		kr = LIST_FIRST(&rnd_global.sources);
 		while (kr != NULL) {
 			if (strncmp(kr->name, rsetnm->name,
 				    MIN(sizeof(kr->name),
 					sizeof(rsetnm->name))) == 0) {
 				krndsource_to_rndsource_est(kr,
 							    &rsetnm->source);
 				mutex_spin_exit(&rnd_global.lock);
 				return (0);
+			}
 			kr = LIST_NEXT(kr, list);
+		}
 		mutex_spin_exit(&rnd_global.lock);
 		ret = ENOENT;           /* name not found */
 		break;
 	case RNDCTL:
 		/*
 		 * Set flags to enable/disable entropy counting and/or
 		 * collection.
 		 */
 		mutex_spin_enter(&rnd_global.lock);
 		rctl = (rndctl_t *)addr;
 		kr = LIST_FIRST(&rnd_global.sources);
 		/*
 		 * Flags set apply to all sources of this type.
 		 */
 		if (rctl->type != 0xff) {
 			while (kr != NULL) {
 				if (kr->type == rctl->type) {
 					krs_setflags(kr,
 						     rctl->flags, rctl->mask);
+				}
 				kr = LIST_NEXT(kr, list);
+			}
 			mutex_spin_exit(&rnd_global.lock);
 			return (0);
+		}
 		/*
 		 * scan through the list, trying to find the name
 		 */
 		while (kr != NULL) {
 			if (strncmp(kr->name, rctl->name,
 				    MIN(sizeof(kr->name),
                                         sizeof(rctl->name))) == 0) {
 				krs_setflags(kr, rctl->flags, rctl->mask);
 				mutex_spin_exit(&rnd_global.lock);
 				return (0);
+			}
 			kr = LIST_NEXT(kr, list);
+		}
 		mutex_spin_exit(&rnd_global.lock);
 		ret = ENOENT;		/* name not found */
 		break;
 	case RNDADDDATA:
 		/*
 		 * Don't seed twice if our bootloader has
 		 * seed loading support.
 		 */
 		if (!boot_rsp) {
 			rnddata = (rnddata_t *)addr;
 			if (rnddata->len > sizeof(rnddata->data))
 				return EINVAL;
 			if (estimate_ok) {
 				/*
 				 * Do not accept absurd entropy estimates, and
 				 * do not flood the pool with entropy such that
 				 * new samples are discarded henceforth.
 				 */
 				estimate = MIN((rnddata->len * NBBY) / 2,
 					       MIN(rnddata->entropy,
 						   RND_POOLBITS / 2));
 			} else {
 				estimate = 0;
+			}
 			mutex_spin_enter(&rnd_global.lock);
 			rndpool_add_data(&rnd_global.pool, rnddata->data,
 					 rnddata->len, estimate);
 			rnd_entropy_added();
 			mutex_spin_exit(&rnd_global.lock);
 			rnd_wakeup_readers();
 		} else {
 			rnd_printf_verbose("rnd"
 			    ": already seeded by boot loader\n");
+		}
 		break;
 	default:
 		return ENOTTY;
+	}
 	return (ret);
+}