linux-kernel - Re: [rtc-linux] Re: [PATCH] rtc: Make rtc_update

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Message-ID: <20090424214117.76bc3dda@i1501.lan.towertech.it>
Date:	Fri, 24 Apr 2009 21:41:17 +0200
From:	Alessandro Zummo <alessandro.zummo@...ertech.it>
To:	Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:	rtc-linux@...glegroups.com, david-b@...bell.net,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	hcegtvedt@...el.com, vapier@...too.org, rongkai.zhan@...driver.com,
	balajirrao@...nmoko.org, broonie@...nsource.wolfsonmicro.com
Subject: Re: [rtc-linux] Re: [PATCH] rtc: Make rtc_update_irq callable with
 irqs enabled

On Sat, 25 Apr 2009 02:06:12 +0900 (JST)
Atsushi Nemoto <anemo@....ocn.ne.jp> wrote:

>  RTC alarm interrupt handler takes rtc->irq_lock by spin_lock()
> > 2. A timer interrupt handler calls rtc_uie_timer() for UIE emulation
> > 3. rtc_uie_timer() waits on rtc->irq_lock .... deadlock!  
> 
> Oops, this is wrong.  This deadlock cannot happen since
> rtc_uie_timer() will be called in bh (softirq) context, not interrupt
> context.

 Correct.

 And we have only one irq handler per driver. Anything else?

-- 

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Torino, Italy

  http://www.towertech.it

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