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drm/gem: add mutex lock when using drm_gem_mmap_obj

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The drm_gem_mmap_obj() has to be protected with dev->struct_mutex,
but some caller functions do not. So it adds mutex lock to missing
callers and adds assertion to check whether drm_gem_mmap_obj() is
called with mutex lock or not.

Signed-off-by: YoungJun Cho <yj44.cho@samsung.com>
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
YoungJun Cho 2013-06-27 08:39:58 +09:00 committed by Dave Airlie
parent 2644ee9614
commit 4368dd846d
3 changed files with 10 additions and 0 deletions
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4
drivers/gpu/drm/drm_gem.c
View file

@ -661,6 +661,8 @@ EXPORT_SYMBOL(drm_gem_vm_close);
* the GEM object is not looked up based on its fake offset. To implement the
* DRM mmap operation, drivers should use the drm_gem_mmap() function.
*
* NOTE: This function has to be protected with dev->struct_mutex
*
* Return 0 or success or -EINVAL if the object size is smaller than the VMA
* size, or if no gem_vm_ops are provided.
*/
@ -669,6 +671,8 @@ int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
{
struct drm_device *dev = obj->dev;
lockdep_assert_held(&dev->struct_mutex);
/* Check for valid size. */
if (obj_size < vma->vm_end - vma->vm_start)
return -EINVAL;

3
drivers/gpu/drm/drm_gem_cma_helper.c
View file

@ -487,9 +487,12 @@ static int drm_gem_cma_dmabuf_mmap(struct dma_buf *dmabuf,
{
struct drm_gem_cma_object *cma_obj = dmabuf->priv;
struct drm_gem_object *gem_obj = &cma_obj->base;
struct drm_device *dev = gem_obj->dev;
int ret;
mutex_lock(&dev->struct_mutex);
ret = drm_gem_mmap_obj(gem_obj, gem_obj->size, vma);
mutex_unlock(&dev->struct_mutex);
if (ret < 0)
return ret;

3
drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
View file

@ -140,12 +140,15 @@ static int omap_gem_dmabuf_mmap(struct dma_buf *buffer,
struct vm_area_struct *vma)
{
struct drm_gem_object *obj = buffer->priv;
struct drm_device *dev = obj->dev;
int ret = 0;
if (WARN_ON(!obj->filp))
return -EINVAL;
mutex_lock(&dev->struct_mutex);
ret = drm_gem_mmap_obj(obj, omap_gem_mmap_size(obj), vma);
mutex_unlock(&dev->struct_mutex);
if (ret < 0)
return ret;