drm/msm: Verify that MSM_SUBMIT_BO_FLAGS are set

For every submission buffer object one of MSM_SUBMIT_BO_WRITE
and MSM_SUBMIT_BO_READ must be set (and nothing else). If we
allowed zero then the buffer object would never get queued to
be unreferenced.

Signed-off-by: Jordan Crouse <[email protected]>
Signed-off-by: Rob Clark <[email protected]>

diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index b6411ea6ed17cac892fd3f5d2400bdc8e846fba2..489676568a10d15ac959093e6a09ee3f133abe45 100644 (file)
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -106,7 +106,8 @@ static int submit_lookup_objects(struct msm_gem_submit *submit,
                        pagefault_disable();
                }
 
-               if (submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) {
+               if ((submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) ||
+                       !(submit_bo.flags & MSM_SUBMIT_BO_FLAGS)) {
                        DRM_ERROR("invalid flags: %x\n", submit_bo.flags);
                        ret = -EINVAL;
                        goto out_unlock;