linux-kernel - Re: BUG: lock held when returning to user space

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Message-ID: <20071029132027.45b51ff8@i1501.lan.towertech.it>
Date:	Mon, 29 Oct 2007 13:20:27 +0100
From:	Alessandro Zummo <alessandro.zummo@...ertech.it>
To:	Jiri Kosina <jikos@...os.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Gabriel C <nix.or.die@...glemail.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	rtc-linux@...glegroups.com
Subject: Re: BUG: lock held when returning to user space

On Sun, 28 Oct 2007 12:12:19 +0100 (CET)
Jiri Kosina <jikos@...os.cz> wrote:

> On Sat, 27 Oct 2007, Andrew Morton wrote:
> 
> > It's a fairly daft thing to do.  I think it'd be saner to teach rtc about
> > test_and_set_bit() personally..  
> 
> 
> From: Jiri Kosina <jkosina@...e.cz>
> 
> RTC: convert mutex to bitfield
> 
> RTC code is using mutex to assure exclusive access to /dev/rtc.
> This is however wrong usage, as it leaves the mutex locked when
> returning into userspace, which is unacceptable.
> 
> Convert rtc->char_lock into bit operation.
> 
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>


 Acked-by: Alessandro Zummo <a.zummo@...ertech.it>

-- 

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Torino, Italy

  http://www.towertech.it

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