Unverified Commit 66e900a3 authored Dec 15, 2017 by Radu Pirea Committed by Mark Brown Dec 19, 2017

spi: atmel: fixed spin_lock usage inside atmel_spi_remove



The only part of atmel_spi_remove which needs to be atomic is hardware
reset.

atmel_spi_stop_dma calls dma_terminate_all and this needs interrupts
enabled.
atmel_spi_release_dma calls dma_release_channel and dma_release_channel
locks a mutex inside of spin_lock.

So the call of these functions can't be inside a spin_lock.

Reported-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Radu Pirea <radu.pirea@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

parent 4fbd8d19

drivers/spi/spi-atmel.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1661,12 +1661,12 @@ static int atmel_spi_remove(struct platform_device *pdev)
		pm_runtime_get_sync(&pdev->dev);

		/* reset the hardware and block queue progress */
		spin_lock_irq(&as->lock);
		if (as->use_dma) {
		atmel_spi_stop_dma(master);
		atmel_spi_release_dma(master);
		}

		spin_lock_irq(&as->lock);
		spi_writel(as, CR, SPI_BIT(SWRST));
		spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
		spi_readl(as, SR);