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 <lu...@denx.de> Link: https://lore.kernel.org/r/20190924110547.14770-2-lu...@denx.de Signed-off-by: Mark Brown <broo...@kernel.org> Reported-by: kbuild test robot <l...@intel.com> --- Changes for v2: - Add #ifdef CONFIG_SPI_SLAVE to not compile in spi_slave_abort() on systems which are only using master mode. (The spi_slave_abort() is 'protected' by this Kconfig define in drivers/spi.c file). This error was spotted by kbuild test robot from Intel. --- drivers/spi/spidev.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c index 255786f2e844..3ea9d8a3e6e8 100644 --- a/drivers/spi/spidev.c +++ b/drivers/spi/spidev.c @@ -627,6 +627,9 @@ 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; -- 2.20.1
