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| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2017-05-08 21:59:24 +0300 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2017-06-02 10:57:08 +0300 |
| commit | c488dd2048662f35c56d002379221edf1a2a9404 (patch) | |
| tree | 30ba3a66adb5ce303f922700bc0ef01122d7a982 /drivers/gpu/drm | |
| parent | 97817fd46518aa2f457ce41f6a9aecd36b461426 (diff) | |
| download | linux-c488dd2048662f35c56d002379221edf1a2a9404.tar.xz | |
drm: omapdrm: Take GEM object reference when exporting dmabuf
To ensure that neither the GEM object nor the DRM device goes away while
a GEM object exported through dma-buf is still accessible, references
must be taken to both the GEM object and the DRM device at export time.
The dma-buf release handler already releases the GEM object, but the
export handler doesn't take a corresponding reference, which results in
a refcount underflow.
Fix this by replacing the custom implementation by
drm_gem_dmabuf_export() and drm_gem_dmabuf_release() that handle
reference counting for us.
Fixes: 6ad11bc3a0b8 ("staging: drm/omap: dmabuf/prime support")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 14 |
1 files changed, 2 insertions, 12 deletions
diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c index 6ab6f52fe31b..863a881dd7cd 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c +++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c @@ -72,16 +72,6 @@ static void omap_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, kfree(sg); } -static void omap_gem_dmabuf_release(struct dma_buf *buffer) -{ - struct drm_gem_object *obj = buffer->priv; - /* release reference that was taken when dmabuf was exported - * in omap_gem_prime_set().. - */ - drm_gem_object_unreference_unlocked(obj); -} - - static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer, enum dma_data_direction dir) { @@ -157,7 +147,7 @@ static int omap_gem_dmabuf_mmap(struct dma_buf *buffer, static struct dma_buf_ops omap_dmabuf_ops = { .map_dma_buf = omap_gem_map_dma_buf, .unmap_dma_buf = omap_gem_unmap_dma_buf, - .release = omap_gem_dmabuf_release, + .release = drm_gem_dmabuf_release, .begin_cpu_access = omap_gem_dmabuf_begin_cpu_access, .end_cpu_access = omap_gem_dmabuf_end_cpu_access, .map_atomic = omap_gem_dmabuf_kmap_atomic, @@ -177,7 +167,7 @@ struct dma_buf *omap_gem_prime_export(struct drm_device *dev, exp_info.flags = flags; exp_info.priv = obj; - return dma_buf_export(&exp_info); + return drm_gem_dmabuf_export(dev, &exp_info); } /* ----------------------------------------------------------------------------- |