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vt8623fb: use display information in info not in var for panning

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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>
This commit is contained in:
Laurent Pinchart 2011-05-25 11:34:52 +02:00
parent 8f0246d628
commit 10a6c1de2c
1 changed files with 5 additions and 4 deletions
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9
drivers/video/vt8623fb.c
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@ -620,13 +620,14 @@ static int vt8623fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *i
unsigned int offset;
/* Calculate the offset */
if (var->bits_per_pixel == 0) {
offset = (var->yoffset / 16) * var->xres_virtual + var->xoffset;
if (info->var.bits_per_pixel == 0) {
offset = (var->yoffset / 16) * info->var.xres_virtual
+ var->xoffset;
offset = offset >> 3;
} else {
offset = (var->yoffset * info->fix.line_length) +
(var->xoffset * var->bits_per_pixel / 8);
offset = offset >> ((var->bits_per_pixel == 4) ? 2 : 1);
(var->xoffset * info->var.bits_per_pixel / 8);
offset = offset >> ((info->var.bits_per_pixel == 4) ? 2 : 1);
}
/* Set the offset */