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-rw-r--r--drivers/video/fbdev/tridentfb.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/video/fbdev/tridentfb.c b/drivers/video/fbdev/tridentfb.c
index 4d20cb557ff0..319131bd72cf 100644
--- a/drivers/video/fbdev/tridentfb.c
+++ b/drivers/video/fbdev/tridentfb.c
@@ -996,6 +996,9 @@ static int tridentfb_check_var(struct fb_var_screeninfo *var,
int ramdac = 230000; /* 230MHz for most 3D chips */
debug("enter\n");
+ if (!var->pixclock)
+ return -EINVAL;
+
/* check color depth */
if (bpp == 24)
bpp = var->bits_per_pixel = 32;