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| author | Imre Deak <imre.deak@intel.com> | 2013-04-19 11:11:56 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2013-05-01 09:40:21 +1000 |
| commit | 011c2282c74db120f01a8414edc66c3f217f5511 (patch) | |
| tree | 5e43eb6b5d21e8aa29e88f0398fcdd7ca55abdb5 /drivers/gpu/drm/drm_prime.c | |
| parent | 219b47339ced80ca580bb6ce7d1636166984afa7 (diff) | |
| download | lwn-011c2282c74db120f01a8414edc66c3f217f5511.tar.gz lwn-011c2282c74db120f01a8414edc66c3f217f5511.zip | |
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 <imre.deak@intel.com>
Cc: stable@vger.kernel.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/drm_prime.c')
| -rw-r--r-- | drivers/gpu/drm/drm_prime.c | 8 |
1 files changed, 7 insertions, 1 deletions
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: |