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

[Alan Cox]

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

> From: Sonic Zhang <sonic.zhang@xxxxxxxxxx>
> 
> 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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