linux-kernel - Re: [BUG] Regression in v2.6.28 introduced by: 'USB: skip Set-Interface(0) if already in altsetting 0'

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Date:	Fri, 02 Jan 2009 13:19:51 +0100
From:	Jan Scholz <scholz@...s.uni-frankfurt.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jan Scholz <scholz@...s.uni-frankfurt.de>,
	linux-kernel@...r.kernel.org, stern@...land.harvard.edu,
	gregkh@...e.de, marcel@...tmann.org
Subject: Re: [BUG] Regression in v2.6.28 introduced by: 'USB: skip Set-Interface(0) if already in altsetting 0'

Ingo Molnar <mingo@...e.hu> writes:

> * Jan Scholz <scholz@...s.uni-frankfurt.de> wrote:
>
>> Hi,
>> 
>> In v2.6.28 my usb bluetooth device disappears after suspend to ram:
>> 
>> $ hcitool dev
>> Devices:
>> 	hci0	00:0D:93:15:D6:E8
>> $ echo mem > /sys/power/state 
>> $ hcitool dev
>> Devices:
>> $
>> 
>> The problem does not occur with the (older) hci_usb.ko, but only with
>> btusb.ko.
>>  
>> This is the output of lsusb:
>> Bus 001 Device 003: ID 05ac:8203 Apple Computer, Inc. Bluetooth HCI
>> 
>> Bisecting finds commit 24c0996 (USB: skip Set-Interface(0) if already in
>> altsetting 0) as the first bad commit, and indeed if I use 2.6.28 with
>> 24c0996 reverted, the bluetooth device survives suspend to ram.
>> 
>> If you need more information/test/etc please let me know.
>> 
>> Regards,
>> Jan
>> 
>> > commit 24c0996a6b73e2554104961afcc8659534503e0d
>> > Author: Alan Stern <stern@...land.harvard.edu>
>> > Date:   Mon Dec 1 10:24:41 2008 -0500
>> >
>> >     USB: skip Set-Interface(0) if already in altsetting 0
>> >
>> >     When a driver unbinds from an interface, usbcore always sends a
>> >     Set-Interface request to reinstall altsetting 0.  Unforunately, quite
>> >     a few devices have buggy firmware that crashes when it receives this
>> >     request.
>> >
>> >     To avoid such problems, this patch (as1180) arranges to send the
>> >     Set-Interface request only when the interface is not already in
>> >     altsetting 0.
>> >
>> >     Signed-off-by: Alan Stern <stern@...land.harvard.edu>
>> >     Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
>
> here's a fix patch that appears to be dealing with aspects of this commit:
>
>   http://lkml.org/lkml/2009/1/2/47
>
> you might want to give it a try.
>
> 	Ingo
>

Hi Ingo,

That patch is actually just 24c099 reverted, and as I wrote in the
previous post it indeed fixes the problem.

Thanks anyway,
   Jan
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