drm/gem: Fix GEM handle release errors

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[ Upstream commit ea2aa97ca3 ]

Currently we are assuming a one to one mapping between dmabuf and
GEM handle when releasing GEM handles.

But that is not always true, since we would create extra handles for the
GEM obj in cases like gem_open() and getfb{,2}().

A similar issue was reported at:
https://lore.kernel.org/all/20211105083308.392156-1-jay.xu@rock-chips.com/

Another problem is that the imported dmabuf might not always have
gem_obj->dma_buf set, which would cause leaks in
drm_gem_remove_prime_handles().

Let's fix these for now by using handle to find the exact map to remove.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220819072834.17888-1-jeffy.chen@rock-chips.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Jeffy Chen 2022-08-19 15:28:34 +08:00 • committed by Greg Kroah-Hartman

parent 2af3d5515e

commit b537612692

3 changed files with 15 additions and 26 deletions

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17

drivers/gpu/drm/drm_gem.c

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4

drivers/gpu/drm/drm_internal.h

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20

drivers/gpu/drm/drm_prime.c

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