linux-kernel - Re: [hrtimers] Re: Regression affecting b43 LP-PHY card

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Date:	Tue, 10 May 2011 21:45:36 +0200
From:	Rafał Miłecki <zajec5@...il.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	b43-dev <b43-dev@...ts.infradead.org>,
	linux-wireless@...r.kernel.org,
	Juan Carlos Romero <juancarlos.romero@...il.com>,
	Larry Finger <Larry.Finger@...inger.net>,
	Ben Greear <greearb@...delatech.com>,
	Jamie Lokier <jamie@...reable.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexander Shishkin <virtuoso@...nd.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [hrtimers] Re: Regression affecting b43 LP-PHY card

2011/5/10 John Stultz <john.stultz@...aro.org>:
> On Tue, 2011-05-10 at 20:57 +0200, Rafał Miłecki wrote:
>> W dniu 10 maja 2011 00:52 użytkownik Rafał Miłecki <zajec5@...il.com> napisał:
>> > In this situation we decided to bisect. I was a little afraid of last
>> > merges so we took older 2.6.38 as GOOD (we tested this twice) and
>> > wireless-testing commit before my ssb changes as BAD. Today Juan
>> > finished bisecting kernel:
>> > http://pastebin.com/HSKbRzpB
>> >
>> > According to his bisection the first bad commit is
>> > e06383db9ec591696a06654257474b85bac1f8cb [0]:
>> > hrtimers: extend hrtimer base code to handle more then 2 clockids
>> >
>> > Does it make any sense to you? Could this be some timing issue?
>> >
>> > It was too late to test this today, we (Juan) will work on this
>> > tomorrow. It's impossible to revert this commit from HEAD of
>> > wireless-testing, so my idea is to checkout commit, test, revert,
>> > test.
>> >
>> > Did anyone else experience any similar problems with latest wireless-testing?
>> >
>> >
>> > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e06383db9ec591696a06654257474b85bac1f8cb
>>
>> Today Juan checkouted commit e06383db9ec591696a06654257474b85bac1f8cb
>> and tested it. He was disconnected really soon.
>>
>> Then he reverted e06383db9ec591696a06654257474b85bac1f8cb and tested
>> again. Connection was stable, he downloaded 2GB file over network.
>>
>>
>> John S.: your commit does not touch Broadcom card directly, but it
>> seems it somehow affects it. I suspect there can be some timing issue.
>> Do you have any idea what could it be, how can we debug this?
>
> Sorry for the trouble!
>
> My commit exposed a few spots where hrtimers were being initialized
> before hrtimer_init is called, which caused problems. Thomas provided a
> solution that makes such behavior still function ok:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=ce31332d3c77532d6ea97ddcb475a2b02dd358b4
>
> Let me know if the issue is still reproducible with Linus' latest git
> tree.

We were using wireless-testing git tree, commit:
1e664a777e5eb4b23e65e76fbeadd2376fe8d8d8

I can not see ce31332d3c77532d6ea97ddcb475a2b02dd358b4 it git log.
I'll apply and test, thanks!

-- 
Rafał
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