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

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Message-Id: <200904240410.52543.david-b@pacbell.net>
Date:	Fri, 24 Apr 2009 04:10:51 -0700
From:	David Brownell <david-b@...bell.net>
To:	Alessandro Zummo <alessandro.zummo@...ertech.it>
Cc:	rtc-linux@...glegroups.com, 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 Friday 24 April 2009, Alessandro Zummo wrote:
>  I'm not tying to fix call issues or lockdep politics,
>  just to understand if it's possible to avoid disabling the IRQs.
> 
>  i.e.,
> 
>  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.


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