linux-kernel - Re: [PATCH] tty: fix bug - kernel can't be pinged through when bootargs console=null

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Message-ID: <20090206100607.277d83e2@the-village.bc.nu>
Date:	Fri, 6 Feb 2009 10:06:07 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bryan Wu <cooloney@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Sonic Zhang <sonic.zhang@...log.com>,
	Bryan Wu <cooloney@...nel.org>
Subject: Re: [PATCH] tty: fix bug - kernel can't be pinged through when
 bootargs console=null

On Fri,  6 Feb 2009 16:27:57 +0800
Bryan Wu <cooloney@...nel.org> wrote:

> From: Sonic Zhang <sonic.zhang@...log.com>
> 
> when pass bootargs console=null into kernel from u-boot, the booted up
> kernel can't be pinged through. This happens after the kernel is upgraded
> to 2.6.28.
> 
> Should check if tty_driver is NULL before call kref_get() in tty_driver_kref_get().

Should not call tty_driver_kref_get(NULL) in the first place....

Need to fix the real bug not paper over it
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