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| author | Rob Clark <robdclark@chromium.org> | 2025-06-29 13:13:22 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-20 18:30:33 +0200 |
| commit | 20406ace80ad27d338023b62e7c83e28e61bafaf (patch) | |
| tree | ecc72754e2dbfa9f3d7aff9cb616fe76a43d506f /drivers/gpu/drm/msm/msm_drv.c | |
| parent | 574fb734ac3d882ed03f776aba39a1788af615ec (diff) | |
drm/msm: use trylock for debugfs
[ Upstream commit 0a1ff88ec5b60b41ba830c5bf08b6cd8f45ab411 ]
This resolves a potential deadlock vs msm_gem_vm_close(). Otherwise for
_NO_SHARE buffers msm_gem_describe() could be trying to acquire the
shared vm resv, while already holding priv->obj_lock. But _vm_close()
might drop the last reference to a GEM obj while already holding the vm
resv, and msm_gem_free_object() needs to grab priv->obj_lock, a locking
inversion.
OTOH this is only for debugfs and it isn't critical if we undercount by
skipping a locked obj. So just use trylock() and move along if we can't
get the lock.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
Tested-by: Antonino Maniscalco <antomani103@gmail.com>
Reviewed-by: Antonino Maniscalco <antomani103@gmail.com>
Patchwork: https://patchwork.freedesktop.org/patch/661525/
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/gpu/drm/msm/msm_drv.c')
0 files changed, 0 insertions, 0 deletions