From: Krzysztof Kozlowski krzk@kernel.org
[ Upstream commit 7684580d45bd3d84ed9b453a4cadf7a9a5605a3f ]
During device removal, 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 removal reverse-matches the probe function, where SPI controller is registered at the end.
Fixes: 05209f457069 ("spi: fsl-dspi: add missing clk_disable_unprepare() in dspi_remove()") Reported-by: Vladimir Oltean olteanv@gmail.com Signed-off-by: Krzysztof Kozlowski krzk@kernel.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200622110543.5035-1-krzk@kernel.org Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spi-fsl-dspi.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index 89d403dfb3bdf..38d337f0967db 100644 --- a/drivers/spi/spi-fsl-dspi.c +++ b/drivers/spi/spi-fsl-dspi.c @@ -1441,11 +1441,20 @@ static int dspi_remove(struct platform_device *pdev) struct fsl_dspi *dspi = spi_controller_get_devdata(ctlr);
/* Disconnect from the SPI framework */ + spi_unregister_controller(dspi->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); if (dspi->irq) free_irq(dspi->irq, dspi); clk_disable_unprepare(dspi->clk); - spi_unregister_controller(dspi->ctlr);
return 0; }