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

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Date:	Thu, 23 Apr 2009 21:55:38 +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 Thu, 23 Apr 2009 12:45:32 -0700
David Brownell <david-b@...bell.net> wrote:

> If the spinlock is *ever* acquired with IRQs disabled,
> it must *always* be acquired that way.
> 
> The typical use is ... from IRQ context, which will in
> some cases mean IRQs disabled.  QED.

 the spinlock could be acquired with IRQs disabled,
 with spin_lock_irq, in the alarm setup functions and
 acquired with the standard spinlock calls in the irq
 handler.

 would it work?

-- 

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Torino, Italy

  http://www.towertech.it

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