From 011c2282c74db120f01a8414edc66c3f217f5511 Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Fri, 19 Apr 2013 11:11:56 +1000 Subject: drm: prime: fix refcounting on the dmabuf import error path In commit be8a42ae60 we inroduced a refcount problem, where on the drm_gem_prime_fd_to_handle() error path we'll call dma_buf_put() for self imported dma buffers. Fix this by taking a reference on the dma buffer in the .gem_import hook instead of assuming the caller had taken one. Besides fixing the bug this is also more logical. Signed-off-by: Imre Deak Cc: stable@vger.kernel.org Reviewed-by: Daniel Vetter Signed-off-by: Dave Airlie --- drivers/gpu/drm/drm_prime.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/drm_prime.c') diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 7830d8e1f212..71c7315ca00f 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -271,7 +271,6 @@ struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev, * refcount on gem itself instead of f_count of dmabuf. */ drm_gem_object_reference(obj); - dma_buf_put(dma_buf); return obj; } } @@ -280,6 +279,8 @@ struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev, if (IS_ERR(attach)) return ERR_PTR(PTR_ERR(attach)); + get_dma_buf(dma_buf); + sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); if (IS_ERR_OR_NULL(sgt)) { ret = PTR_ERR(sgt); @@ -300,6 +301,8 @@ fail_unmap: dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); fail_detach: dma_buf_detach(dma_buf, attach); + dma_buf_put(dma_buf); + return ERR_PTR(ret); } EXPORT_SYMBOL(drm_gem_prime_import); @@ -342,6 +345,9 @@ int drm_gem_prime_fd_to_handle(struct drm_device *dev, goto fail; mutex_unlock(&file_priv->prime.lock); + + dma_buf_put(dma_buf); + return 0; fail: -- cgit v1.2.3