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drm/gem: Properly annotate WW context on drm_gem_lock_reservations() error 

Use ww_acquire_fini() in the error code paths. Otherwise lockdep
thinks that lock is held when lock's memory is freed after the
drm_gem_lock_reservations() error. The ww_acquire_context needs to be
annotated as "released", which fixes the noisy "WARNING: held lock freed!"
splat of VirtIO-GPU driver with CONFIG_DEBUG_MUTEXES=y and enabled lockdep.

Cc: stable@vger.kernel.org
Fixes: 7edc3e3b97 ("drm: Add helpers for locking an array of BO reservations.")
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220630200405.1883897-2-dmitry.osipenko@collabora.com
This commit is contained in:
Dmitry Osipenko 2022-06-30 23:04:04 +03:00 committed by Daniel Vetter
parent df4aaf0157
commit 2939deac1f
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/drm_gem.c
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@ -1226,7 +1226,7 @@ retry:
ret = dma_resv_lock_slow_interruptible(obj->resv,
acquire_ctx);
if (ret) {
ww_acquire_done(acquire_ctx);
ww_acquire_fini(acquire_ctx);
return ret;
}
}
@ -1251,7 +1251,7 @@ retry:
goto retry;
}
ww_acquire_done(acquire_ctx);
ww_acquire_fini(acquire_ctx);
return ret;
}
}