linux-kernel - Re: [RFC PATCH] Rework gpio cansleep (was Re: gpiolib and sleeping gpios)

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Date:	Fri, 25 Jun 2010 00:19:41 -0700 (PDT)
From:	David Brownell <david-b@...bell.net>
To:	Jamie Lokier <jamie@...reable.org>,
	Ryan Mallon <ryan@...ewatersys.com>
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>, gregkh@...e.de,
	linux kernel <linux-kernel@...r.kernel.org>,
	ext-jani.1.nikula@...ia.com,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH] Rework gpio cansleep (was Re: gpiolib and sleeping gpios)



--- On Wed, 6/23/10, Ryan Mallon <ryan@...ewatersys.com> wrote:

> >> In the current code, if a driver ever calls
> gpio_(set/get)_value on a
> >> gpio then you cannot pass a sleeping gpio to that
> driver. The request
> >> will succeed,

No it won't.  Recall that those bit accessor
functions don't return success or failure!!

I'll be submitting a patch soonish, which is
a variant of Jani's patch to make the runtime
warnings trigger more consistently in the
face of such programming errors.




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