linux-kernel - Re: [34-longterm 029/247] iwlagn: enable only rfkill interrupt when device is down

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Date:	Fri, 24 Jun 2011 10:16:53 +0200
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	stable@...nel.org, linux-kernel@...r.kernel.org,
	stable-review@...nel.org,
	"John W. Linville" <linville@...driver.com>
Subject: Re: [34-longterm 029/247] iwlagn: enable only rfkill interrupt when
 device is down

On Thu, Jun 23, 2011 at 01:17:52PM -0400, Paul Gortmaker wrote:
> From: Stanislaw Gruszka <sgruszka@...hat.com>
> 
>                    -------------------
>     This is a commit scheduled for the next v2.6.34 longterm release.
>     If you see a problem with using this for longterm, please comment.
>                    -------------------
> 
> commit 554d1d027b19265c4aa3f718b3126d2b86e09a08 upstream.
> 
> Since commit 6cd0b1cb872b3bf9fc5de4536404206ab74bafdd "iwlagn: fix
> hw-rfkill while the interface is down", we enable interrupts when
> device is not ready to receive them. However hardware, when it is in
> some inconsistent state, can generate other than rfkill interrupts
> and crash the system. I can reproduce crash with "kernel BUG at
> drivers/net/wireless/iwlwifi/iwl-agn.c:1010!" message, when forcing
> firmware restarts.
> 
> To fix only enable rfkill interrupt when down device and after probe.
> I checked patch on laptop with 5100 device, rfkill change is still
> passed to user space when device is down.

This needs follow up:

commit 3dd823e6b86407aed1a025041d8f1df77e43a9c8
Author: Don Fry <donald.h.fry@...el.com>
Date:   Sun Feb 6 09:29:45 2011 -0800

    iwlagn: Re-enable RF_KILL interrupt when down

I'm not sure if that commit is included in the patch series.

Stanislaw
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