From: Daniel Kurtz <djkurtz@chromium.org>
Date: Fri, 30 Mar 2012 11:46:36 +0000 (+0800)
Subject: drm/i915/intel_i2c: handle zero-length writes
X-Git-Tag: v3.5-rc1~83^2~81^2~84
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=26883c31b0799e76edf8f0ea8be48b64e09b2a7d;p=pandora-kernel.git

drm/i915/intel_i2c: handle zero-length writes

A common method of probing an i2c bus is trying to do a zero-length write.
Handle this case by checking the length first before decrementing it.

This is actually important, since attempting a zero-length write 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.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

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