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s3fb: 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>
This commit is contained in:
Laurent Pinchart 2011-05-25 11:34:52 +02:00
parent d8e7a74bf1
commit 305e0e4dbc
1 changed files with 4 additions and 3 deletions
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7
drivers/video/s3fb.c
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@ -1019,12 +1019,13 @@ static int s3fb_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);
(var->xoffset * info->var.bits_per_pixel / 8);
offset = offset >> 2;
}