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spi: stm32: properly handle 0 byte transfer
author
Alain Volmat
<alain.volmat@foss.st.com>
Fri, 5 Feb 2021 18:59:25 +0000
(19:59 +0100)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Thu, 4 Mar 2021 10:38:04 +0000
(11:38 +0100)
[ 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>
drivers/spi/spi-stm32.c
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diff --git
a/drivers/spi/spi-stm32.c
b/drivers/spi/spi-stm32.c
index
6017209
..
6eeb396
100644
(file)
--- 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;