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From: David Brownell <david-b@pacbell.net>
To: Alessandro Zummo <alessandro.zummo@towertech.it>
Subject: Re: [rtc-linux] Re: [PATCH] rtc: Make rtc_update_irq callable with irqs enabled
Date: Fri, 24 Apr 2009 04:10:51 -0700
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Cc: rtc-linux@googlegroups.com, Atsushi Nemoto <anemo@mba.ocn.ne.jp>,
       akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
       hcegtvedt@atmel.com, vapier@gentoo.org, rongkai.zhan@windriver.com,
       balajirrao@openmoko.org, broonie@opensource.wolfsonmicro.com
References: <20090410005820.4fcfcc1f@i1501.lan.towertech.it> <200904240231.12906.david-b@pacbell.net> <20090424120100.76797d20@i1501.lan.towertech.it>
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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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