linux-kernel - Re: [PATCH] iwlwifi: recalculate average tpt if not current

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Date:	Fri, 4 Jun 2010 14:03:28 -0400
From:	"John W. Linville" <linville@...driver.com>
To:	Nils Radtke <lkml@...nk-Future.de>
Cc:	reinette.chatre@...el.com, linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org, stable@...nel.org
Subject: Re: [PATCH] iwlwifi: recalculate average tpt if not current

On Fri, Jun 04, 2010 at 06:32:18PM +0200, Nils Radtke wrote:
>   Hi John,
> 
> http://marc.info/?l=linux-wireless&m=127317062320707&w=2 :
> > > > The BUG_ON was introduced by:
> > > > commit 3110bef78cb4282c58245bc8fd6d95d9ccb19749
> > > > Author: Guy Cohen <guy.cohen@...el.com>
> > > > Date:   Tue Sep 9 10:54:54 2008 +0800
> > > > 
> > > >     iwlwifi: Added support for 3 antennas
> > > > 
> > > > ... the portion adding the BUG_ON is reverted since we are encountering the error
> > > > and BUG_ON was created with assumption that error is not encountered.
> > > > 
> > > > Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
> > > > ---
> > > 
> > > I noticed this patch in your wireless-next-2.6 pull request. Since it is
> > > addressing a system hang issue, could it perhaps be included in
> > > wireless-2.6 also? I should have included the bug report reference for
> > > this purpose, sorry ... it is
> > > https://bugzilla.redhat.com/show_bug.cgi?id=588021
> > 
> > I didn't send it that way because a) that code has been there for a
> > really long time; and b) the reporter couldn't reliably reproduce
> > the bug and therefore can't reliably test the fix.  While I agree
> > that the fix looks harmless, no update is zero-risk.
> > 
> > Can you reliably hit that code?  Has it been tested enough that we
> > should risk holding-up 2.6.34's release for it?
> I'm one of those _very reliably_ hitting this BUG. I can tell how 
> annoying it is. I have to backport the patch w/ every kernel release
> to be able to use the wireless link _at all_. So please consider
> it as somewhat urgent to get the patch included. 
> 
> I'm still in contact w/ Reinette regularly to get those problems fixed.
> It involves physically moving around the city for testing any modification
> so this working is slowly processing as it takes every time an enormous 
> amount of time to do so. Work in (slow) progress, but it's alive..
> C.f. http://permalink.gmane.org/gmane.linux.kernel/992941
> 
> BTW, https://bugzilla.redhat.com/show_bug.cgi?id=588021 this isn't fixed.
> Maybe RH did fix it. kernel.org sources haven't. This is a blocker ever 
> since.

The patch is in linux-2.6.  I suppose it could go to stable@...nel.org.

commit 3d79b2a9eeaa066b35c49fbb17e3156a3c482c3e
Author: Reinette Chatre <reinette.chatre@...el.com>
Date:   Mon May 3 10:55:07 2010 -0700

    iwlwifi: recalculate average tpt if not current
    
    We currently have this check as a BUG_ON, which is being hit by people.
    Previously it was an error with a recalculation if not current, return that
    code.
    
    The BUG_ON was introduced by:
    commit 3110bef78cb4282c58245bc8fd6d95d9ccb19749
    Author: Guy Cohen <guy.cohen@...el.com>
    Date:   Tue Sep 9 10:54:54 2008 +0800
    
        iwlwifi: Added support for 3 antennas
    
    ... the portion adding the BUG_ON is reverted since we are encountering the 
    and BUG_ON was created with assumption that error is not encountered.
    
    Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
    Signed-off-by: John W. Linville <linville@...driver.com>

-- 
John W. Linville		Someday the world will need a hero, and you
linville@...driver.com			might be all we have.  Be ready.
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