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spi: stm32: properly handle 0 byte transfer
[ Upstream commit 2269f5a ] On 0 byte transfer request, return straight from the xfer function after finalizing the transfer. Fixes: dcbe0d8 ("spi: add driver for STM32 SPI controller") Signed-off-by: Alain Volmat <alain.volmat@foss.st.com> Link: https://lore.kernel.org/r/1612551572-495-2-git-send-email-alain.volmat@foss.st.com Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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