linux-kernel - Re: [PATCH 1/2] rtc-ds1511: Fix races around device registration

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Message-Id: <20091013.020415.78716977.anemo@mba.ocn.ne.jp>
Date:	Tue, 13 Oct 2009 02:04:15 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	alessandro.zummo@...ertech.it
Cc:	andy.sharp@....com, thomas.hommel@...anuc.com,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 1/2] rtc-ds1511: Fix races around device registration

On Mon, 12 Oct 2009 18:47:39 +0200, Alessandro Zummo <alessandro.zummo@...ertech.it> wrote:
> > * Call dev_set_drvdata before rtc device creation
> > * Use its own spinlock instead of rtc->irq_lock
> 
>  why?

Because pdata->rtc must be initialized to use the irq_lock
(pdata->rtc->irq_lock).  There is a small window which rtc methods can
be called before pdata->rtc is initialized.

And there is no need use the irq_lock to protect hardware registers.
The driver's own spinlock shoule be enough.

---
Atsushi Nemoto
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