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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2018-09-03 11:31:55 +0200 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2018-09-04 20:00:32 +0200 |
| commit | 5ddd6582cd7ba018b7527eed1777b7d83e6d9b62 (patch) | |
| tree | 2c899d75eff5d048f68d8157916ac729ec68f012 /drivers/gpu/drm/drm_vma_manager.c | |
| parent | drm: Suppress user controlled spam for invalid drm_wait_vblank_ioctl (diff) | |
| download | linux-5ddd6582cd7ba018b7527eed1777b7d83e6d9b62.tar.xz linux-5ddd6582cd7ba018b7527eed1777b7d83e6d9b62.zip | |
drm: Remove "protection" around drm_vma_offset_manager_destroy()
Using a spinlock to serialize the destroy function, within the destroy
function itself does not prevent the buggy driver from shooting
themselves in the foot - either way they still have a use-after-free
issue.
Reported-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Liviu Dudau <Liviu.Dudau@arm.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180903093155.3825-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/drm_vma_manager.c')
| -rw-r--r-- | drivers/gpu/drm/drm_vma_manager.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/drivers/gpu/drm/drm_vma_manager.c b/drivers/gpu/drm/drm_vma_manager.c index a6b2fe36b025..c5d0d2358301 100644 --- a/drivers/gpu/drm/drm_vma_manager.c +++ b/drivers/gpu/drm/drm_vma_manager.c @@ -103,10 +103,7 @@ EXPORT_SYMBOL(drm_vma_offset_manager_init); */ void drm_vma_offset_manager_destroy(struct drm_vma_offset_manager *mgr) { - /* take the lock to protect against buggy drivers */ - write_lock(&mgr->vm_lock); drm_mm_takedown(&mgr->vm_addr_space_mm); - write_unlock(&mgr->vm_lock); } EXPORT_SYMBOL(drm_vma_offset_manager_destroy); |