linux-kernel - Re: [v3.8, v3.9] [Regression] brcmsmac: move PHY functions

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Message-ID: <515C4A89.6040903@canonical.com>
Date:	Wed, 03 Apr 2013 11:28:09 -0400
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	Piotr Haber <phaber@...adcom.com>
CC:	"John W. Linville" <linville@...driver.com>, arend@...adcom.com,
	pieterpg@...adcom.com, meuleman@...adcom.com,
	LKML <linux-kernel@...r.kernel.org>, brudley@...adcom.com,
	frankyl@...adcom.com, linux-wireless@...r.kernel.org,
	brcm80211-dev-list@...adcom.com, netdev@...r.kernel.org
Subject: Re: [v3.8, v3.9] [Regression] brcmsmac: move PHY functions

On 04/02/2013 05:02 AM, Piotr Haber wrote:
> On 04/01/13 17:18, Joseph Salisbury wrote:
>> On 04/01/2013 10:42 AM, John W. Linville wrote:
>>> On Fri, Mar 29, 2013 at 03:52:39PM -0400, Joseph Salisbury wrote:
>>>> Hi Piotr,
>>>>
>>>> A bug was opened against the Ubuntu kernel[0].  After a kernel
>>>> bisect, it was found that reverting the following commit resolved
>>>> this bug:
>>>>
>>>> commit b83576341664957978e125f5f5db2f15496980b1
>>>> Author: Piotr Haber <phaber@...adcom.com>
>>>> Date:   Wed Nov 28 21:44:09 2012 +0100
>>>>
>>>>       brcmsmac: move PHY functions
>>>>
>>>> The regression was introduced as of v3.8-rc1.  The regression still
>>>> exists in v3.9-rc4.
>>>>
>>>> I see that you are the author of this patch, so I wanted to run this
>>>> by you.  I was thinking of requesting a revert for v3.9, but I
>>>> wanted to get your feedback first.
>>>>
>>>>
>>>> Thanks,
>>>>
>>>> Joe
>>>>
>>>> [0] http://pad.lv/1131914
>>> I recently reverted b6fc28a1, which is the follow-on to that patch.
>>> The revert is _not_ in 3.9-rc5.
>>>
>>> Could you try reverting that patch instead?  Does that fix the issue
>>> for you?
>>>
>>> John
>> Hi John,
>>
>> Thanks for the response.
>>
>> Yes, reverting commit b6fc28a1 does resolve this bug.  That is the appropriate fix for this issue.
>> Thanks for the assistance.
>>
>> Thanks,
>>
>> Joe
>>
>>
>>
>>
> Hi Joe,
> could you elaborate a little bit on your failure scenario?
> In bug report you say it happens after suspend/resume, are there any other scenarios you see this
> behaviour? (like disassociation/association without suspend)
> Also you mention it comes back after some time - what is the time needed?
> We had reports of problems on 4313 with this patch (that's why the revert was done) but so far i
> assumed it was a total breakdown, in your case this seem like a transient issue.
This only happens after a suspend/resume cycle.  I haven't seen the 
issue happen with disassociation/association without suspend.  After 
suspend, the connection will re-establish after about 15 minutes or so.

>
> One more thing, could you provide info about your hardware by sending me contents of:
> <debugfs_mount>/brcmsmac/bcma0:0/hardware

board vendor: 144f
board type: 7179
board revision: 1408
board flags: 8402a01
board flags2: 880
firmware revision: 262032c




>
> Kind regards
> Piotr
>
>

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