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

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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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Mark Brown 2014-08-16 16:27:41 +01:00

parent 7d1311b93e

commit 38ec10f60d

1 changed files with 26 additions and 18 deletions

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42

drivers/spi/spi.c

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