drm/radeon/kms: fix oops when set_base is call with no FB

Just do nothing if crct_set_base() is called with no FB.

The oops happens when the user switches between X & vt or in some case
when changing mode.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index c15287a590ff..f5987afcd48d 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -578,8 +578,11 @@ int atombios_crtc_set_base(struct drm_crtc *crtc, int x, int y,
         uint64_t fb_location;
         uint32_t fb_format, fb_pitch_pixels, tiling_flags;
 
-        if (!crtc->fb)
-                return -EINVAL;
+        /* no fb bound */
+        if (!crtc->fb) {
+                DRM_DEBUG("No FB bound\n");
+                return 0;
+        }
 
         radeon_fb = to_radeon_framebuffer(crtc->fb);