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[v3,2/2] drm/gem-shmem: Add import attachment warning to locked pin function

Message ID 20240501065650.2809530-3-adrian.larumbe@collabora.com
State New
Headers show
Series drm: Fix dma_resv deadlock at drm object pin time | expand

Commit Message

Adrián Larumbe May 1, 2024, 6:56 a.m. UTC
Commit ec144244a43f ("drm/gem-shmem: Acquire reservation lock in GEM
pin/unpin callbacks") moved locking DRM object's dma reservation to
drm_gem_shmem_object_pin, and made drm_gem_shmem_pin_locked public, so we
need to make sure the non-NULL check warning is also added to the latter.

Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Boris Brezillon May 2, 2024, 7:01 a.m. UTC | #1
On Wed,  1 May 2024 07:56:00 +0100
Adrián Larumbe <adrian.larumbe@collabora.com> wrote:

> Commit ec144244a43f ("drm/gem-shmem: Acquire reservation lock in GEM
> pin/unpin callbacks") moved locking DRM object's dma reservation to
> drm_gem_shmem_object_pin, and made drm_gem_shmem_pin_locked public, so we
> need to make sure the non-NULL check warning is also added to the latter.
> 
> Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
> ---
>  drivers/gpu/drm/drm_gem_shmem_helper.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index 177773bcdbfd..ad5d9f704e15 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -233,6 +233,8 @@ int drm_gem_shmem_pin_locked(struct drm_gem_shmem_object *shmem)
>  
>  	dma_resv_assert_held(shmem->base.resv);
>  
> +	drm_WARN_ON(shmem->base.dev, shmem->base.import_attach);

If we add a WARN_ON() here, we can probably drop the one in
drm_gem_shmem_pin(), and do the same for drm_gem_shmem_unpin[_locked]()
to keep things consistent.

> +
>  	ret = drm_gem_shmem_get_pages(shmem);
>  
>  	return ret;
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Patch

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 177773bcdbfd..ad5d9f704e15 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -233,6 +233,8 @@  int drm_gem_shmem_pin_locked(struct drm_gem_shmem_object *shmem)
 
 	dma_resv_assert_held(shmem->base.resv);
 
+	drm_WARN_ON(shmem->base.dev, shmem->base.import_attach);
+
 	ret = drm_gem_shmem_get_pages(shmem);
 
 	return ret;