Unverified Commit 2269f5a8 authored by Alain Volmat's avatar Alain Volmat Committed by Mark Brown
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spi: stm32: properly handle 0 byte transfer 



On 0 byte transfer request, return straight from the
xfer function after finalizing the transfer.

Fixes: dcbe0d84 ("spi: add driver for STM32 SPI controller")
Signed-off-by: default avatarAlain 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: default avatarMark Brown <broonie@kernel.org>
parent d290da83

drivers/spi/spi-stm32.c

+4 −0
Original line number Diff line number Diff line
@@ -1657,6 +1657,10 @@ static int stm32_spi_transfer_one(struct spi_master *master, 
	struct stm32_spi *spi = spi_master_get_devdata(master);

	int ret;



	/* Don't do anything on 0 bytes transfers */

	if (transfer->len == 0)

		return 0;



	spi->tx_buf = transfer->tx_buf;

	spi->rx_buf = transfer->rx_buf;

	spi->tx_len = spi->tx_buf ? transfer->len : 0;