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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2017-05-08 21:59:24 +0300
committerTomi Valkeinen <tomi.valkeinen@ti.com>2017-06-02 10:57:08 +0300
commitc488dd2048662f35c56d002379221edf1a2a9404 (patch)
tree30ba3a66adb5ce303f922700bc0ef01122d7a982 /drivers/gpu/drm
parent97817fd46518aa2f457ce41f6a9aecd36b461426 (diff)
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.c14
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);
}
/* -----------------------------------------------------------------------------