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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2020-05-11 12:35:53 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2020-06-08 18:03:41 +0300 |
| commit | 5264083573184aba8a0e760f6ebb902326e40162 (patch) | |
| tree | fdd2da7af9f724e464b9d6012f039955709bc497 /drivers/gpu/drm/drm_gem_shmem_helper.c | |
| parent | 6e60d5ded06baa69cca0b6337053c99b54211624 (diff) | |
| download | linux-5264083573184aba8a0e760f6ebb902326e40162.tar.xz | |
drm/shmem-helpers: Ensure get_pages is not called on imported dma-buf
Just a bit of light paranoia. Also sprinkle this check over
drm_gem_shmem_get_sg_table, which should only be called when
exporting, same for the pin/unpin functions, on which it relies to
work correctly.
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Boris Brezillon <boris.brezillon@collabora.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200511093554.211493-9-daniel.vetter@ffwll.ch
Diffstat (limited to 'drivers/gpu/drm/drm_gem_shmem_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_gem_shmem_helper.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index afe9668f1750..06cee8e97d27 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -170,6 +170,8 @@ int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem) { int ret; + WARN_ON(shmem->base.import_attach); + ret = mutex_lock_interruptible(&shmem->pages_lock); if (ret) return ret; @@ -225,6 +227,8 @@ int drm_gem_shmem_pin(struct drm_gem_object *obj) { struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); + WARN_ON(shmem->base.import_attach); + return drm_gem_shmem_get_pages(shmem); } EXPORT_SYMBOL(drm_gem_shmem_pin); @@ -240,6 +244,8 @@ void drm_gem_shmem_unpin(struct drm_gem_object *obj) { struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); + WARN_ON(shmem->base.import_attach); + drm_gem_shmem_put_pages(shmem); } EXPORT_SYMBOL(drm_gem_shmem_unpin); @@ -510,6 +516,8 @@ static void drm_gem_shmem_vm_open(struct vm_area_struct *vma) struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); int ret; + WARN_ON(shmem->base.import_attach); + ret = drm_gem_shmem_get_pages(shmem); WARN_ON_ONCE(ret != 0); @@ -611,6 +619,8 @@ struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_object *obj) { struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); + WARN_ON(shmem->base.import_attach); + return drm_prime_pages_to_sg(shmem->pages, obj->size >> PAGE_SHIFT); } EXPORT_SYMBOL_GPL(drm_gem_shmem_get_sg_table); |