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

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Date:	Fri, 24 Apr 2009 13:13:34 +0200
From:	Alessandro Zummo <alessandro.zummo@...ertech.it>
To:	rtc-linux@...glegroups.com
Cc:	david-b@...bell.net, Atsushi Nemoto <anemo@....ocn.ne.jp>,
	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 Fri, 24 Apr 2009 04:10:51 -0700
David Brownell <david-b@...bell.net> wrote:

> >  use spin_lock() in the IRQ handler and spin_lock_irq/irq_save
> >  in the setup functions.  
> 
> I think you're describing how the *current* scheme is supposed
> to work ... except that some IRQ handlers aren't calling the
> rtc_update_irq() routine with IRQs blocked.
> 
> Yes, that current scheme works ... modulo those buggy handlers.

 ok, but why it's necessary to disable the interrupts? Only because
 the specs says so or because there's a locking issue I'm missing?

-- 

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Torino, Italy

  http://www.towertech.it

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