linux-kernel - Re: [patch 2.6.19-rc6] rtc class locking bugfixes

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Date:	Mon, 20 Nov 2006 00:49:03 +0100
From:	Alessandro Zummo <alessandro.zummo@...ertech.it>
To:	David Brownell <david-b@...bell.net>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>, akpm@...l.org
Subject: Re: [patch 2.6.19-rc6] rtc class locking bugfixes

On Thu, 16 Nov 2006 23:27:37 -0800
David Brownell <david-b@...bell.net> wrote:

> I got a lockdep warning when running "rtctest" so I though it'd be good
> to see what was up.
> 
>  - The warning was for rtc->irq_task_lock, gotten from rtc_update_irq()
>    by irq handlerss ... but in a handful of other cases, grabbed without
>    blocking IRQs.
> 
>  - Some callers to rtc_update_irq() were not ensuring IRQs were blocked,
>    yet the routine expects that; make sure all callers block IRQs.
> 
> It would appear that RTC API tests haven't been part of anyone's kernel
> regression test suite recently, at least not with lockdep running.
> 
> Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>

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

-- 

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Turin, Italy

  http://www.towertech.it

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