Unverified Commit 3c525b69 authored Jun 22, 2020 by Krzysztof Kozlowski Committed by Mark Brown Jun 22, 2020

spi: spi-fsl-dspi: Fix lockup if device is shutdown during SPI transfer



During shutdown, the driver should unregister the SPI controller
and stop the hardware.  Otherwise the dspi_transfer_one_message() could
wait on completion infinitely.

Additionally, calling spi_unregister_controller() first in device
shutdown reverse-matches the probe function, where SPI controller is
registered at the end.

Fixes: dc234825 ("spi: spi-fsl-dspi: Adding shutdown hook")
Reported-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200622110543.5035-2-krzk@kernel.org


Signed-off-by: Mark Brown <broonie@kernel.org>

parent 7684580d

drivers/spi/spi-fsl-dspi.c

+1 −14

Original line number	Diff line number	Diff line
		@@ -1452,20 +1452,7 @@ static int dspi_remove(struct platform_device *pdev)

		static void dspi_shutdown(struct platform_device *pdev)
		{
		struct spi_controller *ctlr = platform_get_drvdata(pdev);
		struct fsl_dspi *dspi = spi_controller_get_devdata(ctlr);

		/* Disable RX and TX */
		regmap_update_bits(dspi->regmap, SPI_MCR,
		SPI_MCR_DIS_TXF \| SPI_MCR_DIS_RXF,
		SPI_MCR_DIS_TXF \| SPI_MCR_DIS_RXF);

		/* Stop Running */
		regmap_update_bits(dspi->regmap, SPI_MCR, SPI_MCR_HALT, SPI_MCR_HALT);

		dspi_release_dma(dspi);
		clk_disable_unprepare(dspi->clk);
		spi_unregister_controller(dspi->ctlr);
		dspi_remove(pdev);
		}

		static struct platform_driver fsl_dspi_driver = {

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