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spi: bcm2835: Tear down DMA before turning off SPI controller

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On unbind of the BCM2835 SPI driver, the SPI controller is disabled
first and the DMA channels are terminated and torn down afterwards.

This seems backwards:  In the theoretical case that DMA is active,
it might try to fill the SPI FIFOs even after the controller has
been disabled.

Reverse the order, thereby mirroring what's done on ->probe().

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Link: https://lore.kernel.org/r/ac79f1e3d6fd9a1f5e0cb4008c43b98ea70be3c2.1589557526.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lukas Wunner 2020-05-15 17:58:04 +02:00 committed by Mark Brown
parent c38a4905ca
commit 05897c710e
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1 changed files with 2 additions and 2 deletions
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4
drivers/spi/spi-bcm2835.c
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@ -1380,14 +1380,14 @@ static int bcm2835_spi_remove(struct platform_device *pdev)
spi_unregister_controller(ctlr);
bcm2835_dma_release(ctlr, bs);
/* Clear FIFOs, and disable the HW block */
bcm2835_wr(bs, BCM2835_SPI_CS,
BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX);
clk_disable_unprepare(bs->clk);
bcm2835_dma_release(ctlr, bs);
return 0;
}