arkfb: use display information in info not in var for panning

We must not use any information in the passed var besides xoffset,
yoffset and vmode as otherwise applications might abuse it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Ondrej Zajicek <santiago@crfreenet.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/drivers/video/arkfb.c b/drivers/video/arkfb.c
index 8686429cbdf07b57af8564849ad64b7a8624ff16..555dd4c64f5be24a1a13986f84fe19360f1d9102 100644 (file)
--- a/drivers/video/arkfb.c
+++ b/drivers/video/arkfb.c
@@ -908,13 +908,14 @@ static int arkfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info
        unsigned int offset;
 
        /* Calculate the offset */
-       if (var->bits_per_pixel == 0) {
-               offset = (var->yoffset / 16) * (var->xres_virtual / 2) + (var->xoffset / 2);
+       if (info->var.bits_per_pixel == 0) {
+               offset = (var->yoffset / 16) * (info->var.xres_virtual / 2)
+                      + (var->xoffset / 2);
                offset = offset >> 2;
        } else {
                offset = (var->yoffset * info->fix.line_length) +
-                        (var->xoffset * var->bits_per_pixel / 8);
-               offset = offset >> ((var->bits_per_pixel == 4) ? 2 : 3);
+                        (var->xoffset * info->var.bits_per_pixel / 8);
+               offset = offset >> ((info->var.bits_per_pixel == 4) ? 2 : 3);
        }
 
        /* Set the offset */