spi: stm32: fix DMA configuration with only one channel

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When SPI driver is configured to work only with TX or RX DMA channel
then dmaengine functions can dereferene NULL pointer.

Running full-duplex mode when when only RX or TX DMA channel is
available can cause overrun condition or incorrect writing to transmit
buffer so disable this types of DMA configuration and go back to
interrupt mode.

Signed-off-by: Cezary Gapinski <cezary.gapinski@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

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Cezary Gapinski 2018-12-24 23:00:29 +01:00 • committed by Mark Brown

parent d4c9134a6c

commit 2cbee7f886

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1 changed files with 12 additions and 8 deletions

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drivers/spi/spi-stm32.c

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