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

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Message-ID: <20071029132020.4731aa01@i1501.lan.towertech.it>
Date:	Mon, 29 Oct 2007 13:20:20 +0100
From:	Alessandro Zummo <alessandro.zummo@...ertech.it>
To:	rtc-linux@...glegroups.com
Cc:	jikos@...os.cz, Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Gabriel C <nix.or.die@...glemail.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [rtc-linux] Re: BUG: lock held when returning to user space

On Sun, 28 Oct 2007 00:47:15 +0200 (CEST)
Jiri Kosina <jikos@...os.cz> wrote:

> Yes, but the fact is that is really is invalid use of mutex -- because the 
> mutex owner could become seriously wrong after fork() or sending the 
> filedescriptor through unix socket ... this easily leads to broken 
> situation.
> 
> This seems to have been introduced in e824290e5d ... Alessandro, could you 
> convert this to test_and_set_bit()/clear_bit() semantics instead of a 
> mutex please?

 Hi Jiri,
   I was away for the weekend and just saw the whole discussion
 and your patch and I'm happy to ack it. Thank you very much
 a thanks to Gabriel for the bug report!
 

-- 

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Torino, Italy

  http://www.towertech.it

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