linux-kernel - Re: [PATCH] rtc: rtc-stmp3xxx: provide timeout for potentially endless loop polling a HW bit

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Message-ID: <20130802080607.GA2992@katana>
Date:	Fri, 2 Aug 2013 10:06:07 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Lothar Waßmann <LW@...O-electronics.de>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc: rtc-stmp3xxx: provide timeout for potentially
 endless loop polling a HW bit

On Wed, Jul 31, 2013 at 04:29:01PM +0200, Lothar Waßmann wrote:
> It's always a bad idea to poll on HW bits without a timeout.
> 
> The i.MX28 RTC can be easily brought into a state in which the RTC is
> not running (until after a power-on-reset) and thus the status bits
> which are polled in the driver won't ever change.
> 
> This patch prevents the kernel from getting stuck in this case.
> 
> Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>

Acked-by: Wolfram Sang <wsa@...-dreams.de>


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