[PATCH] uvesafb: fix selecting mode with the vbemode option
From: Michal Januszewski <spock@gentoo.org>
Date: 2008-11-02 12:35:31
Also in:
lkml
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
If the vbemode option is used, uvesafb calls fb_get_mode() without first setting the resolution in info->var. This results in a division by zero in fb_get_mode(), as evidenced e.g. in [1]. Fix this by ensuring the info->var structure is populated before fb_get_mode() is called. [1] http://bugzilla.kernel.org/show_bug.cgi?id=11661#c37 Signed-off-by: Michal Januszewski <spock@gentoo.org> ---
diff --git a/drivers/video/uvesafb.c b/drivers/video/uvesafb.c
index 5074422..592c302 100644
--- a/drivers/video/uvesafb.c
+++ b/drivers/video/uvesafb.c@@ -842,14 +842,16 @@ static int __devinit uvesafb_vbe_init_mode(struct fb_info *info) if (vbemode) { for (i = 0; i < par->vbe_modes_cnt; i++) { if (par->vbe_modes[i].mode_id == vbemode) { + modeid = i; + uvesafb_setup_var(&info->var, info, + &par->vbe_modes[modeid]); fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, - &info->var, info); + &info->var, info); /* * With pixclock set to 0, the default BIOS * timings will be used in set_par(). */ info->var.pixclock = 0; - modeid = i; goto gotmode; } }
@@ -896,8 +898,11 @@ static int __devinit uvesafb_vbe_init_mode(struct fb_info *info) fb_videomode_to_var(&info->var, mode); } else { modeid = par->vbe_modes[0].mode_id; + uvesafb_setup_var(&info->var, info, + &par->vbe_modes[modeid]); fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, - &info->var, info); + &info->var, info); + goto gotmode; } }
@@ -909,9 +914,9 @@ static int __devinit uvesafb_vbe_init_mode(struct fb_info *info) if (modeid == -1) return -EINVAL; -gotmode: uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]); +gotmode: /* * If we are not VBE3.0+ compliant, we're done -- the BIOS will * ignore our timings anyway.