| 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 |
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;
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;
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(+)