CVS commit: src/sys/external/bsd/drm2/linux

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

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.