linux-kernel - Re: [PATCH v2] gpiolib: allow poll(2) on gpio value

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Date:	Thu, 2 Jul 2009 15:16:17 -0700
From:	David Brownell <david-b@...bell.net>
To:	Jani Nikula <ext-jani.1.nikula@...ia.com>
Cc:	Daniel Glöckner <dg@...ix.com>,
	Ben Nizette <bn@...sdigital.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] gpiolib: allow poll(2) on gpio value

On Thursday 02 July 2009, Jani Nikula wrote:
> I'm trying to say that if you call gpio_export() to create a sysfs
> node, a subsequent poll() in user space won't work because there is no
> irq set up, and sysfs_notify_dirent() won't be called. The patch
> doesn't provide an interface for setting that up from kernel after
> gpio_export() call - it's only possible to set up edge triggering and
> sysfs notify by writing to the "edge" node from user space.

OK, now I understand.  :)

Yeah, that seems fixable in followups.
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