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| author | Alain Volmat <alain.volmat@foss.st.com> | 2021-02-05 21:59:25 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-04 13:38:04 +0300 |
| commit | 03a422ecf30d50487f723f283f0ecc38f1a70e63 (patch) | |
| tree | d06a8b0c45a8a799ded49d0d977d543bef8dea26 | |
| parent | a46f34ba2563425b98bf6c087f8857f64fa8871f (diff) | |
| download | linux-03a422ecf30d50487f723f283f0ecc38f1a70e63.tar.xz | |
spi: stm32: properly handle 0 byte transfer
[ Upstream commit 2269f5a8b1a7b38651d62676b98182828f29d11a ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -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 6017209c6d2f..6eeb39669a86 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -1677,6 +1677,10 @@ 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; |