linux-kernel - Re: [BUG] 3.10 regression: hang on suspend

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Date:	Fri, 19 Jul 2013 14:11:03 +0200
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Ortwin Glück <odi@....ch>
Cc:	Arend van Spriel <arend@...adcom.com>,
	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: [BUG] 3.10 regression: hang on suspend

On Fri, Jul 19, 2013 at 02:08:42PM +0200, Stanislaw Gruszka wrote:
> On Thu, Jul 18, 2013 at 08:57:59PM +0200, Ortwin Glück wrote:
> > On 07/18/2013 12:55 PM, Stanislaw Gruszka wrote:
> > >objdump -r -d --prefix-addresses net/mac80211/mac80211.ko > mac80211.txt
> > >objdump -r -d --prefix-addresses drivers/net/wireless/iwlwifi/dvm/iwldvm.ko > iwldvm.txt
> > 
> > Here you go. Please note, that the offsets have changed due to
> > .config changes. New trace attached. Transcript:
> > 
> > iwlagn_mac_remove_interface+0x5f/0x160
> > __ieee80211_suspend+0x4a1/0xb30
> > ieee80211_suspend+0x1a/0x20
> 
> Crash happen because we call iwlagn_mac_remove_interface with
> vif_priv->ctx NULL. I do not see any possibility of that other than
> doing ->remove_interface without previous ->add_interface, but I do
> not see how that possible. 
> 
> Does crash happen on any suspend or on second one ?  
> 
> I'm attaching patch, which should prevent crash (but not fix the issue,
> just workaround it), plese apply it. If it make suspend work, please then
> reload iwlwifi module with debug=0x3 option, suspend/resume machine and
> provide dmesg output after that.

This time really attaching forgotten patch.

Stanislaw

View attachment "iwlwifi_check_ctx_null.patch" of type "text/plain" (502 bytes)