Re: [rtc-linux] Re: [PATCH] rtc: Make rtc_update_irq callable withirqs enabled

[Alessandro Zummo]

On Sat, 25 Apr 2009 02:06:12 +0900 (JST)
Atsushi Nemoto <anemo@xxxxxxxxxxxxx> 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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