CVS commit: [netbsd-8] src/sys/external/bsd/drm2/linux

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Tue Aug  1 17:29:15 UTC 2023

Modified Files:
        src/sys/external/bsd/drm2/linux [netbsd-8]: linux_ww_mutex.c

Log Message:
Pull up following revision(s) (requested by riastradh in ticket #1876):

        sys/external/bsd/drm2/linux/linux_ww_mutex.c: revision 1.15

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


To generate a diff of this commit:
cvs rdiff -u -r1.2.10.5 -r1.2.10.6 \
    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.