spi: dw-dma: Check rx_buf availability in the xfer method

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Checking rx_buf for being NULL and returning NULL from the Rx-channel
preparation method doesn't let us to distinguish that situation from
errors happening during the Rx SG-list preparation. So it's better to make
sure that the rx_buf not-NULL and full-duplex communication is requested
prior calling the Rx preparation method.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20200920112322.24585-5-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Mark Brown <broonie@kernel.org>

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Serge Semin 2020-09-20 14:23:15 +03:00 • committed by Mark Brown

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commit be3034d9f9

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drivers/spi/spi-dw-dma.c

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