From: Mark Brown <broonie@linaro.org>
Date: Sat, 16 Aug 2014 15:27:41 +0000 (+0100)
Subject: spi: Only call transfer_one() if we have buffers to transfer
X-Git-Tag: fixes-for-v3.18-merge-window~30^2~6^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=38ec10f60d9ca3a7eb3a5b52500a67479296b86f;p=pandora-kernel.git

spi: Only call transfer_one() if we have buffers to transfer

Client drivers such as the ChomeOS EC driver sometimes use transfers with
no buffers and only a delay specified in order to allow a delay after the
assertion of /CS. Rather than require controller drivers handle this noop
case gracefully put checks in the core to ensure that we don't call into
the controller for such transfers.

Reported-by: Addy Ke <addy.ke@rock-chips.com>
Tested-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
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