linux-kernel - Re: [PATCH 1/1] driver/tty: Fix a warning in check_tty

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Date:	Wed, 16 Jul 2014 18:36:55 +0800
From:	"Li, ZhenHua" <zhen-hual@...com>
To:	Jiri Slaby <jslaby@...e.cz>
CC:	Peter Hurley <peter@...leysoftware.com>,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] driver/tty: Fix a warning in check_tty_count

Hi Jiri,
You are right, I tested the latest kernel, did not see this bug.
So I will only submit this patch to Redhat.

Thanks
Zhenhua

On 07/15/2014 05:16 PM, Jiri Slaby wrote:
> Hi,
>
> On 07/15/2014 11:08 AM, Li, ZhenHua wrote:
>> This bug  was founded in RHEL 6, kernel version 2.6.32.
>>
>> But I also checked the file tty_io.c in  latest kernel, not all the code
>> protected by tty_lock(tty).
>>
>> For example,  in function tty_del_file,
>>
>>      if (--tty->count < 0) {
>>      }
>> and
>>      tty_del_file(filp);
>> are not surrounded by tty_lock(tty).
> Sure, but there is tty_lock_pair instead.
>
>> So I think the new lock is necessary.
> Nope, sorry, you have to complain to RedHat about this kernel. Unless
> you can reproduce this with the vanilla kernel.
>
> thanks,

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