linux-kernel - Re: [BUG] at drivers/char/vt.c:3332 do_blank

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Message-Id: <200702221552.14491.caglar@pardus.org.tr>
Date:	Thu, 22 Feb 2007 15:52:11 +0200
From:	"S.Çağlar Onur" <caglar@...dus.org.tr>
To:	"Antonino A. Daplas" <adaplas@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	lkml <linux-kernel@...r.kernel.org>, spock@...too.org
Subject: Re: [BUG] at drivers/char/vt.c:3332 do_blank_screen() on resume

Hi;

22 Şub 2007 Per tarihinde, Antonino A. Daplas şunları yazmıştı: 
> Ah, and you have fb_splash too.  That's why the tracing was not what I
> expected it to be.
>
> Try using video=vesafb:noblank to disable hardware blanking and find out
> if you can still reproduce the oops.

I'll try and also will try to reproduce with vanilla one.

> After grepping for change_console, all callers of change_console and
> complete_change_console are acquiring the console semaphore, so I really
> don't know what's going on here...
>
> Since you are using a non-vanilla kernel, can you just do
> a grep change_console of the kernel source and see if you can find a
> caller that missed doing an acquire_console_sem().

fbsplash and vesafb-tng has no change_console call and patched one seems same 
with vanilla one.

[caglar@...getsu][~/svk/playground/caglar/kernel/kernel/files/gentoo]> grep 
change_console fbsplash-0.9.2-r5.patch
[caglar@...getsu][~/svk/playground/caglar/kernel/kernel/files/gentoo]> grep 
change_console vesafb-tng-1.0-rc2.patch
[caglar@...getsu][~/svk/playground/caglar/kernel/kernel/files/gentoo]>

zangetsu linux-2.6.20 # grep change_console *  -r
drivers/char/vt_ioctl.c:static void complete_change_console(struct vc_data 
*vc);
drivers/char/vt_ioctl.c:                                
complete_change_console(vc_cons[newvt].d);
drivers/char/vt_ioctl.c:static void complete_change_console(struct vc_data 
*vc)
drivers/char/vt_ioctl.c:         * clean up (similar to logic employed in 
change_console())
drivers/char/vt_ioctl.c:void change_console(struct vc_data *new_vc)
drivers/char/vt_ioctl.c:        complete_change_console(new_vc);
drivers/char/vt.c:                      
change_console(vc_cons[want_console].d);
include/linux/vt_kern.h:void change_console(struct vc_data *new_vc);

Cheers
-- 
S.Çağlar Onur <caglar@...dus.org.tr>
http://cekirdek.pardus.org.tr/~caglar/

Linux is like living in a teepee. No Windows, no Gates and an Apache in house!

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