drm/radeon/r1xx-r4xx: don't use radeon_crtc for vblank callback

This might be called before we've allocated the radeon_crtcs

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index 8d7e33a0b243..163c33e1a1d6 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -80,10 +80,12 @@ MODULE_FIRMWARE(FIRMWARE_R520);
  */
 void r100_wait_for_vblank(struct radeon_device *rdev, int crtc)
 {
-        struct radeon_crtc *radeon_crtc = rdev->mode_info.crtcs[crtc];
         int i;
 
-        if (radeon_crtc->crtc_id == 0) {
+        if (crtc >= rdev->num_crtc)
+                return;
+
+        if (crtc == 0) {
                 if (RREG32(RADEON_CRTC_GEN_CNTL) & RADEON_CRTC_EN) {
                         for (i = 0; i < rdev->usec_timeout; i++) {
                                 if (!(RREG32(RADEON_CRTC_STATUS) & RADEON_CRTC_VBLANK_CUR))