linux-kernel - Re: [PATCH v8 3/5] amba: Don't unprepare the clocks if device driver wants IRQ safe runtime PM

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Date:	Mon, 3 Nov 2014 15:44:33 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Jonathan Corbet <corbet@....net>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Ulf Hansson <ulf.hansson@...aro.org>, linux-pm@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
	Michal Simek <michal.simek@...inx.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v8 3/5] amba: Don't unprepare the clocks if device driver
 wants IRQ safe runtime PM

On Mon, Nov 03, 2014 at 10:41:02AM -0500, Alan Stern wrote:
> Bear in mind, however, that once the irq_safe flag has been set, the 
> runtime PM core offers no way to turn it off again.

Ah, I thought it did permit it to change both ways.  In that case, we
don't need to validate that it doesn't change state on each call, and
we can just get away with checking its value.

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