linux-kernel - Re: [PATCH -next] Input: i8042 - Fix pagefault caused by i8042_dmi_laptop

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Date:	Thu, 10 Sep 2009 21:57:31 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Jin Dongming <jin.dongming@...css.fujitsu.com>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Linux Input <linux-input@...r.kernel.org>,
	LKLM <linux-kernel@...r.kernel.org>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Subject: Re: [PATCH -next] Input: i8042 - Fix pagefault caused by
	i8042_dmi_laptop_table

Hi Jin,

On Fri, Sep 11, 2009 at 12:16:01PM +0900, Jin Dongming wrote:
> (This patch fixes bug of commit 1c49cd1bbb6e41e97079d389e86063ba5de825ed
>  titled "Input: i8042 - bypass AUX IRQ delivery test on laptops")
> 
> When dmi_platform_init is called, the table i8042_dmi_laptop_table[] will
> be checked. Because the end of this table is not "NULL", dmi_check_system
> will lead to pagefault and oops will be happened.
> 
> In fact I got following oops on boot:
> Call Trace:
>   [<ffffffff813f86b8>] panic+0x7a/0x131
>   [<ffffffff8105b29b>] ? exit_ptrace+0x94/0x114
>   [<ffffffff81054acc>] do_exit+0x7a/0x695
>   [<ffffffff813fbaec>] oops_end+0xb9/0xc1
>   [<ffffffff81034037>] no_context+0x1f6/0x205
>   [<ffffffff81034212>] __bad_area_nosemaphore+0x1cc/0x1f2
>   [<ffffffff811f1739>] ? string+0x40/0x9f
>   [<ffffffff811f20cf>] ? vsnprintf+0x8b/0x426
>   [<ffffffff813fac0a>] ?_spin_unlock_irqrestore+0x29/0x41
>   [<ffffffff8103424b>] bad_area_nosemaphore+0x13/0x15
>   [<ffffffff813fcf9d>] do_page_fault+0x154/0x2a5
>   [<ffffffff813faef5>] page_fault+0x25/0x30
>   [<ffffffff81335895>] ? dmi_check_system+0x30/0x4b
>   [<ffffffff816eee5f>] i8042_init+0x2ca/0x3c1
>   [<ffffffff816ee5eb>] ? uhci_hcd_init+0x88/0xc0
>   [<ffffffff816eeb95>] ? i8042_init+0x0/0x3c1
>   [<ffffffff8100a069>] do_one_initcall+0x5e/0x15e
>   [<ffffffff816be167>] kernel_init+0x170/0x1ca
>   [<ffffffff81012c5a>] child_rip+0xa/0x20
>   [<ffffffff810125bd>] ? restore_args+0x0/0x30
>   [<ffffffff81bbdff7>] ? kernel_init+0x0/0x1ca
>   [<ffffffff81012c50>] ? child_rip+0x0/0x20
> 
> I confirmed this patch fix this problem.
> 

Thank you for the patch, I will ford it into the original change so that
we don't crash the box in case someone will be bisecting...

-- 
Dmitry
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