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[PATCH] rivafb/nvidiafb: race between register_framebuffer and *_bl_init 

Since we now use the generic backlight infrastructure, I think we need to
call rivafb_bl_init before calling register_framebuffer since otherwise
rivafb_bl_init might race with the framebuffer layer already opening the
device and setting up the video mode.  In this case we might end up with a
not yet fully intialized backlight (info->bl_dev still NULL) when calling
riva_bl_set_power via rivafb_set_par/rivafb_load_video_mode and the kernel
dies without any further notice during boot.

This fixes booting current git on a PB 6,1.  In this case radeonfb/atyfb
would be affected too - I can fix that too but don't have any hardware to
test this on.

Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Guido Guenther 2006-07-30 03:04:21 -07:00 committed by Linus Torvalds
parent b1367d2a28
commit ce38cac482
2 changed files with 5 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/video/nvidia/nvidia.c
View File

@ -1299,20 +1299,19 @@ static int __devinit nvidiafb_probe(struct pci_dev *pd,
nvidia_save_vga(par, &par->SavedReg);
pci_set_drvdata(pd, info);
nvidia_bl_init(par);
if (register_framebuffer(info) < 0) {
printk(KERN_ERR PFX "error registering nVidia framebuffer\n");
goto err_out_iounmap_fb;
}
pci_set_drvdata(pd, info);
printk(KERN_INFO PFX
"PCI nVidia %s framebuffer (%dMB @ 0x%lX)\n",
info->fix.id,
par->FbMapSize / (1024 * 1024), info->fix.smem_start);
nvidia_bl_init(par);
NVTRACE_LEAVE();
return 0;

7
drivers/video/riva/fbdev.c
View File

@ -2132,6 +2132,9 @@ static int __devinit rivafb_probe(struct pci_dev *pd,
fb_destroy_modedb(info->monspecs.modedb);
info->monspecs.modedb = NULL;
pci_set_drvdata(pd, info);
riva_bl_init(info->par);
ret = register_framebuffer(info);
if (ret < 0) {
printk(KERN_ERR PFX
@ -2139,8 +2142,6 @@ static int __devinit rivafb_probe(struct pci_dev *pd,
goto err_iounmap_screen_base;
}
pci_set_drvdata(pd, info);
printk(KERN_INFO PFX
"PCI nVidia %s framebuffer ver %s (%dMB @ 0x%lX)\n",
info->fix.id,
@ -2148,8 +2149,6 @@ static int __devinit rivafb_probe(struct pci_dev *pd,
info->fix.smem_len / (1024 * 1024),
info->fix.smem_start);
riva_bl_init(info->par);
NVTRACE_LEAVE();
return 0;