spi: Add call to spi_slave_abort() function when spidev driver is released
[ Upstream commit 9f918a728c
]
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>
5.4-rM2-2.2.x-imx-squashed
parent
c0dcfa7f8e
commit
a3a547e8df
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@ -627,6 +627,9 @@ static int spidev_release(struct inode *inode, struct file *filp)
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if (dofree)
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kfree(spidev);
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}
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#ifdef CONFIG_SPI_SLAVE
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spi_slave_abort(spidev->spi);
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#endif
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mutex_unlock(&device_list_lock);
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return 0;
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