Messages in this thread Patch in this message |  | | From | Alain Volmat <> | Subject | [PATCH v2 1/8] spi: stm32: properly handle 0 byte transfer | Date | Fri, 5 Feb 2021 19:59:25 +0100 |
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On 0 byte transfer request, return straight from the xfer function after finalizing the transfer.
Fixes: dcbe0d84dfa5 ("spi: add driver for STM32 SPI controller") Signed-off-by: Alain Volmat <alain.volmat@foss.st.com> --- v2: remove useless spi_finalize_current_transfer
drivers/spi/spi-stm32.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c index db3e305d9ec4..6cdecd1c5ec7 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -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; -- 2.17.1
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