From a4fce9cb782ad340ee5576a38e934e5e75832dc6 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 5 Oct 2016 13:21:44 +0100 Subject: drm/prime: Take a ref on the drm_dev when exporting a dma_buf MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Chris Wilson Cc: Petri Latvala Cc: Daniel Vetter Cc: stable@vger.kernel.org Tested-by: Petri Latvala Reviewed-by: Christian König Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/20161005122145.1507-2-chris@chris-wilson.co.uk --- include/drm/drmP.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/drm') 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, -- cgit v1.2.3