linux-kernel - Re: [PATCH 2/2] chipidea: Use devm_request

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Message-ID: <20130731132708.GQ9858@sirena.org.uk>
Date:	Wed, 31 Jul 2013 14:27:08 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Tejun Heo <htejun@...il.com>
Cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Peter Chen <peter.chen@...escale.com>,
	Fabio Estevam <festevam@...il.com>,
	alexander.shishkin@...ux.intel.com, kernel@...gutronix.de,
	linux-usb@...r.kernel.org,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Jeff Garzik <jeff@...zik.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	Mike Turquette <mturquette@...aro.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] chipidea: Use devm_request_irq()

On Wed, Jul 31, 2013 at 07:55:27AM -0400, Tejun Heo wrote:

> If you have DMA / IRQ / command engine deactivations in devm path
> which often is the case with full conversions, freeing any resources
> including DMA areas and host private data in the wrong order is a
> horrible idea.  It's worse as it won't really be noticeable in most
> cases.

It's really only interrupts that affect most devices - if there's DMA or
anything going on after the remove() then as you said earlier the driver
is probably doing something wrong.

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