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drm/shmem-helper: Add lockdep asserts to vmap/vunmap

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Since commit 21aa27ddc5 ("drm/shmem-helper: Switch to reservation
lock"), the drm_gem_shmem_vmap and drm_gem_shmem_vunmap functions
require that the caller holds the DMA reservation lock for the object.
Add lockdep assertions to help validate this.

Signed-off-by: Asahi Lina <lina@asahilina.net>
Signed-off-by: Daniel Almeida <daniel.almeida@collabora.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://lore.kernel.org/r/20250318-drm-gem-shmem-v1-1-64b96511a84f@collabora.com
This commit is contained in:
Asahi Lina
2025-03-18 16:22:35 -03:00
committed by Lyude Paul
parent e33c3f4d93
commit 64a8d0aa55
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/drm_gem_shmem_helper.c
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@@ -348,6 +348,8 @@ int drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem,
struct drm_gem_object *obj = &shmem->base;
int ret = 0;
dma_resv_assert_held(obj->resv);
if (drm_gem_is_imported(obj)) {
ret = dma_buf_vmap(obj->dma_buf, map);
} else {
@@ -408,6 +410,8 @@ void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *shmem,
{
struct drm_gem_object *obj = &shmem->base;
dma_resv_assert_held(obj->resv);
if (drm_gem_is_imported(obj)) {
dma_buf_vunmap(obj->dma_buf, map);
} else {