linux-kernel - Re: [usb gadget] WARNING: at kernel/mutex.c:198 __mutex_lock

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Message-ID: <51320173.6000802@linutronix.de>
Date:	Sat, 02 Mar 2013 14:41:07 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Fengguang Wu <fengguang.wu@...el.com>
CC:	Felipe Balbi <balbi@...com>,
	Maarten Lankhorst <m.b.lankhorst@...il.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [usb gadget] WARNING: at kernel/mutex.c:198 __mutex_lock_common()

On 03/02/2013 02:37 PM, Fengguang Wu wrote:
> On Wed, Feb 27, 2013 at 12:49:35PM +0200, Felipe Balbi wrote:
>> Hi,
>>
>> On Wed, Feb 06, 2013 at 10:04:24AM +0800, Fengguang Wu wrote:
>>> Greetings,
>>>
>>> I got the below warning and the first bad commit is
>>
>> can you send a fixup patch ?
> 
> Sorry I don't have the fix. Maarten once proposed
> 
> : Can you change __mutex_lock_common from inline to __always_inline and
> : check if that gets rid of the warning?
> 
> and it worked at that time, however it does not work today when I
> go out to double check the below patch...

This does not get even close to a fix, not to mention a proper one. The
problem is that a spinlock is hold while a mutex is going to be taken.
Maybe I get to this…

Sebastian
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