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authorChris Wilson <chris@chris-wilson.co.uk>2016-10-05 13:21:44 +0100
committerDaniel Vetter <daniel.vetter@ffwll.ch>2016-10-05 15:30:32 +0200
commita4fce9cb782ad340ee5576a38e934e5e75832dc6 (patch)
tree528aa09d8be2f3fcbe72e3a8b972fc6e6711a68d /include/drm
parent56a76c0123d6cb034975901c80fce2627338ef9e (diff)
downloadlinux-a4fce9cb782ad340ee5576a38e934e5e75832dc6.tar.bz2
drm/prime: Take a ref on the drm_dev when exporting a dma_buf
dma_buf may live a long time, longer than the last direct user of the driver. We already hold a reference to the owner module (that prevents the object code from disappearing), but there is no reference to the drm_dev - so the pointers to the driver backend themselves may vanish. v2: Resist temptation to fix the bug in armada_gem.c not setting the correct flags on the exported dma-buf (it should pass the flags through and not be arbitrarily setting O_RDWR). Use a common wrapper for exporting the dmabuf and acquiring the reference to the drm_device. Testcase: igt/vgem_basic/unload Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Petri Latvala <petri.latvala@intel.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: stable@vger.kernel.org Tested-by: Petri Latvala <petri.latvala@intel.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161005122145.1507-2-chris@chris-wilson.co.uk
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drmP.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 81fcd553edf7..672644031bd5 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1011,6 +1011,8 @@ static inline int drm_debugfs_remove_files(const struct drm_info_list *files,
}
#endif
+struct dma_buf_export_info;
+
extern struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *obj,
int flags);
@@ -1021,6 +1023,8 @@ extern struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf);
extern int drm_gem_prime_fd_to_handle(struct drm_device *dev,
struct drm_file *file_priv, int prime_fd, uint32_t *handle);
+struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
+ struct dma_buf_export_info *exp_info);
extern void drm_gem_dmabuf_release(struct dma_buf *dma_buf);
extern int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,