[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" <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/video/nvidia/nvidia.c

···
 
 	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;

drivers/video/riva/fbdev.c

···
 
 	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
···
 		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,
 		RIVAFB_VERSION,
 		info->fix.smem_len / (1024 * 1024),
 		info->fix.smem_start);
-
-	riva_bl_init(info->par);
 
 	NVTRACE_LEAVE();
 	return 0;