netdev - Re: [PATCH regression/bisected] Revert "brcmsmac: support 4313iPA"

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Date:	Wed, 27 Mar 2013 11:43:13 -0400
From:	"John W. Linville" <linville@...driver.com>
To:	David Herrmann <dh.herrmann@...il.com>
Cc:	Piotr Haber <phaber@...adcom.com>, linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Arend van Spriel <arend@...adcom.com>,
	brcm80211-dev-list@...adcom.com, netdev@...r.kernel.org,
	Pieter-Paul Giesberts <pieterpg@...adcom.com>
Subject: Re: [PATCH regression/bisected] Revert "brcmsmac: support 4313iPA"

On Wed, Mar 27, 2013 at 04:32:28PM +0100, David Herrmann wrote:
> Hi John
> 
> On Wed, Mar 27, 2013 at 3:56 PM, John W. Linville
> <linville@...driver.com> wrote:
> > On Tue, Mar 26, 2013 at 10:31:00AM +0100, Piotr Haber wrote:
> >> On 03/25/13 19:58, John W. Linville wrote:
> >> > On Mon, Mar 18, 2013 at 02:58:08PM +0100, David Herrmann wrote:
> >> >> Hi Piotr
> >> >>
> >> >> On Mon, Mar 18, 2013 at 2:49 PM, Piotr Haber <phaber@...adcom.com> wrote:
> >> >>> On 03/18/13 11:45, David Herrmann wrote:
> >> >>>> This reverts commit b6fc28a158076ca2764edc9a6d1e1402f56e1c0c. It breaks
> >> >>>> wireless AP reconnection on: (14e4:4727)
> >> >>>>   Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller
> >> >>>>
> >> >>>> Any attempt to reconnect to an AP results in timeouts no matter how near to the
> >> >>>> AP I am:
> >> >>>>  00:10:40 $nb kernel: wlan0: authenticate with 00:18:39:0a:8e:23
> >> >>>>  00:10:40 $nb kernel: wlan0: direct probe to 00:18:39:0a:8e:23 (try 1/3)
> >> >>>>  00:10:40 $nb kernel: wlan0: direct probe to 00:18:39:0a:8e:23 (try 2/3)
> >> >>>>  00:10:41 $nb kernel: wlan0: direct probe to 00:18:39:0a:8e:23 (try 3/3)
> >> >>>>  00:10:41 $nb kernel: wlan0: authentication with 00:18:39:0a:8e:23 timed out
> >> >>>> ---
> >> >>>> Hi
> >> >>>>
> >> >>>> I tried coming up with a fix instead of reverting this commit, but the commit is
> >> >>>> way to big for me to understand what's going on. Sorry.
> >> >>>>
> >> >>>> With linux-3.8 connecting to an AP broke on my machine. I could connect to an AP
> >> >>>> one time, but any further attempt resulted in:
> >> >>>>  00:10:40 $nb kernel: wlan0: authenticate with 00:18:39:0a:8e:23
> >> >>>>  00:10:40 $nb kernel: wlan0: direct probe to 00:18:39:0a:8e:23 (try 1/3)
> >> >>>>  00:10:40 $nb kernel: wlan0: direct probe to 00:18:39:0a:8e:23 (try 2/3)
> >> >>>>  00:10:41 $nb kernel: wlan0: direct probe to 00:18:39:0a:8e:23 (try 3/3)
> >> >>>>  00:10:41 $nb kernel: wlan0: authentication with 00:18:39:0a:8e:23 timed out
> >> >>>>
> >> >>>> Even sitting right next to the AP didn't help so I started bisecting and it
> >> >>>> turned out to be:
> >> >>>>   "brcmsmac: support 4313iPA" b6fc28a158076ca2764edc9a6d1e1402f56e1c0c
> >> >>>> Please revert it.
> >> >>>>
> >> >>>> Thanks
> >> >>>> David
> >> >>>>
> >> >>> Hi,
> >> >>> unfortunately this is not a first report of this patch breaking 4313 for some users.
> >> >>> I'm pretty confident that it is hardware revision related as we have 4313ePA and iPA boards running
> >> >>> successfully in our test setup.
> >> >>> Could you aid us in effort of finding the problem by supplying the contents of this debugfs file:
> >> >>> <debugfs_mount>/brcmsmac/bcma0:0/hardware
> >> >>
> >> >> Hi
> >> >>
> >> >> $ cat /sys/kernel/debug/brcmsmac/bcma0\:0/hardware
> >> >> board vendor: 185f
> >> >> board type: 51a
> >> >> board revision: 1408
> >> >> board flags: 8402a01
> >> >> board flags2: 880
> >> >> firmware revision: 262032b
> >> >>
> >> >> I can also try partial reverts of that commit, but I really don't know
> >> >> which parts might be important.
> >> >
> >> > Are we going to see a fix for this (very) soon?  Or should I just go
> >> > ahead and revert this patch?
> >> >
> >> I cannot reproduce the issue on a set of devices we have here (3 different 4313 ePA models).
> >> Some of the devices that are reported to be broken are being shipped to us.
> >> So I would say we need around 2 weeks at least to resolve this (if we reproduce the problem and find
> >> a fix).
> >> Not sure this is soon enough.
> >> If not please go ahead an revert the patch.
> >
> > I am reverting the patch.
> 
> Can you CC stable? Otherwise I will try to sent it to them after you applied it.

Sorry, I already pushed it out to kernel.org.  I would prefer not to modify my repository now.

-- 
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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