From: Lukasz Majewski lukma@denx.de
[ Upstream commit 9f918a728cf86b2757b6a7025e1f46824bfe3155 ]
This change is necessary for spidev devices (e.g. /dev/spidev3.0) working in the slave mode (like NXP's dspi driver for Vybrid SoC).
When SPI HW works in this mode - the master is responsible for providing CS and CLK signals. However, when some fault happens - like for example distortion on SPI lines - the SPI Linux driver needs a chance to recover from this abnormal situation and prepare itself for next (correct) transmission.
This change doesn't pose any threat on drivers working in master mode as spi_slave_abort() function checks if SPI slave mode is supported.
Signed-off-by: Lukasz Majewski lukma@denx.de Link: https://lore.kernel.org/r/20190924110547.14770-2-lukma@denx.de Signed-off-by: Mark Brown broonie@kernel.org Reported-by: kbuild test robot lkp@intel.com Link: https://lore.kernel.org/r/20190925091143.15468-2-lukma@denx.de Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spidev.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c index c5fe08bc34a0a..028725573e632 100644 --- a/drivers/spi/spidev.c +++ b/drivers/spi/spidev.c @@ -634,6 +634,9 @@ static int spidev_release(struct inode *inode, struct file *filp) if (dofree) kfree(spidev); } +#ifdef CONFIG_SPI_SLAVE + spi_slave_abort(spidev->spi); +#endif mutex_unlock(&device_list_lock);
return 0;