linux-kernel - Re: Oops in uart_resume_port() on resume 2.6.32/33-rc

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Message-ID: <c4e36d111001040818i23f4a331y58412ab82c8b4e14@mail.gmail.com>
Date:	Mon, 4 Jan 2010 17:18:53 +0100
From:	Zdenek Kabelac <zdenek.kabelac@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	dsaxena@...top.org, alan@...ux.intel.com, gregkh@...e.de
Subject: Re: Oops in uart_resume_port() on resume 2.6.32/33-rc

2010/1/4 Zdenek Kabelac <zdenek.kabelac@...il.com>:
> Hi
>
> I wanted to trace some oops from i915 module via serial console log
> and instead I'm getting this oops from resume:
>
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000198
> IP: [<ffffffff812eee55>] uart_resume_port+0x1f5/0x270
> PGD 1396b6067 PUD 13baf4067 PMD 0
> Oops: 0000 [#1] PREEMPT SMP
> last sysfs file: /sys/power/state

> So I assume it is related to commit:
>
> ba15ab0e8de0d4439a91342ad52d55ca9e313f3d
>
> which adds access through  *state->port.tty->termios  without checking for NULL.
>

Small update - I've compiled current vanilla kernel
45d28b097280a78893ce25a5d0db41e6a2717853
(2.6.33-rc2-00268) just with reverted patch ba15ab0e8de0d and it works
and doesn't produce uart oops on resume - thought it's not probably
the right  fix - it is usable workaround for me...

Zdenek
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