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savagefb: 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. Also use the
aligned fix.line_length and not the (possible) unaligned xres_virtual.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Tormod Volden <debian.tormod@gmail.com>
This commit is contained in:
Laurent Pinchart 2011-05-25 11:34:52 +02:00
parent 305e0e4dbc
commit e1599cf8c7
1 changed files with 7 additions and 9 deletions
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16
drivers/video/savage/savagefb_driver.c
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@ -1477,15 +1477,9 @@ static void savagefb_set_par_int(struct savagefb_par *par, struct savage_reg *r
vgaHWProtect(par, 0);
}
static void savagefb_update_start(struct savagefb_par *par,
struct fb_var_screeninfo *var)
static void savagefb_update_start(struct savagefb_par *par, int base)
{
int base;
base = ((var->yoffset * var->xres_virtual + (var->xoffset & ~1))
* ((var->bits_per_pixel+7) / 8)) >> 2;
/* now program the start address registers */
/* program the start address registers */
vga_out16(0x3d4, (base & 0x00ff00) | 0x0c, par);
vga_out16(0x3d4, ((base & 0x00ff) << 8) | 0x0d, par);
vga_out8(0x3d4, 0x69, par);
@ -1550,8 +1544,12 @@ static int savagefb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct savagefb_par *par = info->par;
int base;
savagefb_update_start(par, var);
base = (var->yoffset * info->fix.line_length
+ (var->xoffset & ~1) * ((info->var.bits_per_pixel+7) / 8)) >> 2;
savagefb_update_start(par, base);
return 0;
}