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spi: Add call to spi_slave_abort() function when spidev driver is released

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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>
This commit is contained in:
Lukasz Majewski 2019-09-25 11:11:42 +02:00 committed by Mark Brown
parent 6fe7ab3837
commit 9f918a728c
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1 changed files with 3 additions and 0 deletions
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3
drivers/spi/spidev.c
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@ -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;