From: Dmitry Osipenko dmitry.osipenko@collabora.com
commit 2939deac1fa220bc82b89235f146df1d9b52e876 upstream.
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: 7edc3e3b975b5 ("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-dmitr... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/drm_gem.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -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; } }