diff options
| author | Radu Pirea <radu.pirea@microchip.com> | 2017-12-15 18:40:17 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-03 12:24:25 +0300 |
| commit | 3cf652bedcb9acd5491715adc7996f35d33c409a (patch) | |
| tree | 25dad48fed40478f2d686b2faa3e161e02d4682f /drivers/spi | |
| parent | 52a63f35cd70fd2fdfdf148b1896d2659c5aa3ed (diff) | |
| download | linux-3cf652bedcb9acd5491715adc7996f35d33c409a.tar.xz | |
spi: atmel: fixed spin_lock usage inside atmel_spi_remove
[ Upstream commit 66e900a3d225575c8b48b59ae1fe74bb6e5a65cc ]
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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-atmel.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c index f95da364c283..669470971023 100644 --- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -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); |