linux-kernel - Re: [BUG] NULL pointer dereference in uart_write

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Message-ID: <4820813D.6050608@candelatech.com>
Date:	Tue, 06 May 2008 09:03:09 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	rmk@....linux.org.uk, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] NULL pointer dereference in uart_write_room().

Alan Cox wrote:
>> (5) uart_remove_one_port() is called by serial8250_register_port()
>>     since ttyS0 is already in use but it is requested to be once removed.
>>     
>
> That means 8250_pnp is taking over and then trying to delete the console,
> so its breakage in the serial layer glue. Perhaps Russell has some ideas
> as its hard to tell what he intended to happen originally.
>   
For what it's worth, I've been seeing this problem since about 2.6.23 on 
several
different systems, and will be happy to test patches.  The work-around 
of changing
the .config file will be fine in the meantime, it seems.

Thanks,
Ben

> Alan
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-- 
Ben Greear <greearb@...delatech.com> 
Candela Technologies Inc  http://www.candelatech.com


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