acornfb: Dont BUG() on invalid pan parameters

The driver currently BUG()s if the pan parameters passed directly from
userspace are invalid. Return -EINVAL instead.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/video/acornfb.c b/drivers/video/acornfb.c
index 6183a57eb69d..3bacc1290548 100644
--- a/drivers/video/acornfb.c
+++ b/drivers/video/acornfb.c
@@ -852,7 +852,8 @@ acornfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
         if (!(var->vmode & FB_VMODE_YWRAP))
                 y_bottom += var->yres;
 
-        BUG_ON(y_bottom > var->yres_virtual);
+        if (y_bottom > var->yres_virtual)
+                return -EINVAL;
 
         acornfb_update_dma(info, var);