diff options
| author | Alain Volmat | 2021-02-05 19:59:25 +0100 |
|---|---|---|
| committer | Mark Brown | 2021-02-05 19:16:55 +0000 |
| commit | 2269f5a8b1a7b38651d62676b98182828f29d11a (patch) | |
| tree | 71adb74584ab69136bb13a51e3bf3ba463305222 /drivers/spi | |
| parent | d290da83cb099d2d259d1dedacdf2f0375b2ecf0 (diff) | |
spi: stm32: properly handle 0 byte transfer
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>
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>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-stm32.c | 4 |
1 files changed, 4 insertions, 0 deletions
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; |