drm/radeon: check for allocation failure in radeon_ring_backup()

Static checkers complain if this we don't check for allocation failure.
Also we can use the new kmalloc_array() function here as a cleanup.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index f2fc25de0b2f21564a288fbf4f248f3c47b1d324..ec79b37504306f2709036bebe6949f7afc2a90cf 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -594,7 +594,11 @@ unsigned radeon_ring_backup(struct radeon_device *rdev, struct radeon_ring *ring
        }
 
        /* and then save the content of the ring */
-       *data = kmalloc(size * 4, GFP_KERNEL);
+       *data = kmalloc_array(size, sizeof(uint32_t), GFP_KERNEL);
+       if (!*data) {
+               mutex_unlock(&rdev->ring_lock);
+               return 0;
+       }
        for (i = 0; i < size; ++i) {
                (*data)[i] = ring->ring[ptr++];
                ptr &= ring->ptr_mask;