From: Daniel Kurtz <djkurtz@chromium.org>
Date: Fri, 13 Apr 2012 11:47:53 +0000 (+0800)
Subject: drm/i915/intel_i2c: handle zero-length reads
X-Git-Tag: v3.5-rc1~83^2~81^2~51
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=79985eee842ef146ed6307a29fdc2fa008036421;p=pandora-kernel.git

drm/i915/intel_i2c: handle zero-length reads

A common method of probing an i2c bus is trying to do a zero-length read.
Handle this case by checking the length first waiting for data to be read.

This is actually important, since attempting a zero-length read is one
of the ways that i2cdetect and i2c_new_probed_device detect whether
there is device present on the bus with a given address.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=48269
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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