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

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Date:	Fri, 19 Jul 2013 14:08:43 +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 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.

Thanks
Stanislaw

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