From e1599cf8c7ab93cb4bbd67516f5c989211335df1 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Wed, 25 May 2011 11:34:52 +0200 Subject: [PATCH] savagefb: 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. Also use the aligned fix.line_length and not the (possible) unaligned xres_virtual. Signed-off-by: Laurent Pinchart Reviewed-by: Tormod Volden --- drivers/video/savage/savagefb_driver.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-) diff --git a/drivers/video/savage/savagefb_driver.c b/drivers/video/savage/savagefb_driver.c index 4de541ca9c5..beb495044b2 100644 --- a/drivers/video/savage/savagefb_driver.c +++ b/drivers/video/savage/savagefb_driver.c @@ -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; + + base = (var->yoffset * info->fix.line_length + + (var->xoffset & ~1) * ((info->var.bits_per_pixel+7) / 8)) >> 2; - savagefb_update_start(par, var); + savagefb_update_start(par, base); return 0; } -- 2.39.5