diff options
| author | Radu Pirea <radu.pirea@microchip.com> | 2017-12-15 17:40:17 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-03 10:23:22 +0100 |
| commit | 90f7d14cef9bd30214dd7e56fc3c7a468cef6228 (patch) | |
| tree | 658bf1e8af618af25400a6a1bee34a2c2dc99dce | |
| parent | ad176934842636d8b1d23298fb90d10a97e4c6f7 (diff) | |
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@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 8feac599e9ab..44be6b593b30 100644 --- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -1669,12 +1669,12 @@ 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(as); atmel_spi_release_dma(as); } + 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); |