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Date: Sat, 29 Jul 2023 22:43:56 +0000
From: "Taylor R Campbell" <riastradh@netbsd.org>
Subject: CVS commit: src/sys/external/bsd/drm2/linux
To: source-changes@NetBSD.org
Approved: for-source-only
Reply-To: riastradh@netbsd.org
Message-Id: <20230729224356.A73FBFBDB@cvs.NetBSD.org>

Module Name:	src
Committed By:	riastradh
Date:		Sat Jul 29 22:43:56 UTC 2023

Modified Files:
	src/sys/external/bsd/drm2/linux: linux_ww_mutex.c

Log Message:
drm/linux_ww_mutex: Fix wait loops.

If cv_wait_sig returns because a signal is delivered, we may
nonetheless have been granted the lock.  It is harmless for us to
ignore this fact in three of the four paths, but in
ww_mutex_state_wait_sig, we may now have ownership of the lock and
MUST NOT return failure because the caller MUST release the lock
before destroying the ww_acquire_ctx.

While here, restructure the other three loops for clarity, so they
match the structure of the fourth and so they have a little less
impenetrable negation.

PR kern/57537

XXX pullup-8
XXX pullup-9
XXX pullup-10


To generate a diff of this commit:
cvs rdiff -u -r1.14 -r1.15 src/sys/external/bsd/drm2/linux/linux_ww_mutex.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.