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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2020-10-28 12:31:20 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2020-11-27 16:43:54 +0100 |
| commit | 57fcd550eb15bce14a7154736379dfd4ed60ae81 (patch) | |
| tree | c7744650575016e8e7bc2d94ecb4fafd0ed2ef1b | |
| parent | c6c90c70db4d9a0989111d6b994d545659410f7a (diff) | |
| download | linux-57fcd550eb15bce14a7154736379dfd4ed60ae81.tar.gz linux-57fcd550eb15bce14a7154736379dfd4ed60ae81.tar.bz2 linux-57fcd550eb15bce14a7154736379dfd4ed60ae81.zip | |
drm/ttm: Warn on pinning without holding a reference
Not technically a problem for ttm, but very likely a driver bug and
pretty big time confusing for reviewing code.
So warn about it, both at cleanup time (so we catch these for sure)
and at pin/unpin time (so we know who's the culprit).
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Huang Rui <ray.huang@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201028113120.3641237-1-daniel.vetter@ffwll.ch
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_bo.c | 2 | ||||
| -rw-r--r-- | include/drm/ttm/ttm_bo_api.h | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c index 9a03c7834b1e..fc6b619c0329 100644 --- a/drivers/gpu/drm/ttm/ttm_bo.c +++ b/drivers/gpu/drm/ttm/ttm_bo.c @@ -514,7 +514,7 @@ static void ttm_bo_release(struct kref *kref) * shrinkers, now that they are queued for * destruction. */ - if (bo->pin_count) { + if (WARN_ON(bo->pin_count)) { bo->pin_count = 0; ttm_bo_del_from_lru(bo); ttm_bo_add_mem_to_lru(bo, &bo->mem); diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h index 2564e66e67d7..79b9367e0ffd 100644 --- a/include/drm/ttm/ttm_bo_api.h +++ b/include/drm/ttm/ttm_bo_api.h @@ -600,6 +600,7 @@ static inline bool ttm_bo_uses_embedded_gem_object(struct ttm_buffer_object *bo) static inline void ttm_bo_pin(struct ttm_buffer_object *bo) { dma_resv_assert_held(bo->base.resv); + WARN_ON_ONCE(!kref_read(&bo->kref)); ++bo->pin_count; } @@ -613,6 +614,7 @@ static inline void ttm_bo_unpin(struct ttm_buffer_object *bo) { dma_resv_assert_held(bo->base.resv); WARN_ON_ONCE(!bo->pin_count); + WARN_ON_ONCE(!kref_read(&bo->kref)); --bo->pin_count; } |