From 362196e5d0832ce3c4e1df376c02cff812a2391b Mon Sep 17 00:00:00 2001
From: Doug Anderson <dianders@chromium.org>
Date: Wed, 30 Apr 2014 10:44:05 -0700
Subject: [PATCH] mfd: cros_ec: spi: Add mutex to cros_ec_spi

The main transfer function for cros_ec_spi can be called by more than
one client at a time.  Make sure that those clients don't stomp on
each other by locking the bus for the duration of the transfer
function.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Andrew Bresticker <abrestic@chromium.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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