drm/radeon: r6xx/r7xx: fix possible oops in r600_page_table_cleanup()

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/r600_cp.c b/drivers/gpu/drm/radeon/r600_cp.c
index 37249b26f836ebd0cd413a37a613588c69d50aa0..f915f1153b41b550b5f4f688ebf2a7f1af74ddc2 100644 (file)
--- a/drivers/gpu/drm/radeon/r600_cp.c
+++ b/drivers/gpu/drm/radeon/r600_cp.c
@@ -121,6 +121,9 @@ void r600_page_table_cleanup(struct drm_device *dev, struct drm_ati_pcigart_info
        int pages;
        int i;
 
+       if (!entry)
+               return;
+
        if (gart_info->bus_addr) {
                max_pages = (gart_info->table_size / sizeof(u32));
                pages = (entry->pages <= max_pages)