diff options
| author | YoungJun Cho <yj44.cho@samsung.com> | 2013-06-27 08:39:58 +0900 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2013-06-28 12:30:15 +1000 |
| commit | 4368dd846d067ed7d11281050e7676ae614d6053 (patch) | |
| tree | e97b6d50520fa74b0281000425fe54ed37c52665 | |
| parent | 2644ee9614be67abe155f1073bb9e1b737bbca53 (diff) | |
drm/gem: add mutex lock when using drm_gem_mmap_obj
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>
| -rw-r--r-- | drivers/gpu/drm/drm_gem.c | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_gem_cma_helper.c | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 3 |
3 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 43217138816d..34c0be70f178 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -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; diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c index 9efabceed42e..ce063970d68c 100644 --- a/drivers/gpu/drm/drm_gem_cma_helper.c +++ b/drivers/gpu/drm/drm_gem_cma_helper.c @@ -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; diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c index 3256693de110..4fcca8d42796 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c +++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c @@ -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; |