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iio: adc: stm32-adc: fix stopping dma 

There maybe a race when using dmaengine_terminate_all(). The predisable
routine may call iio_triggered_buffer_predisable() prior to a pending DMA
callback.
Adopt dmaengine_terminate_sync() to ensure there's no pending DMA request
before calling iio_triggered_buffer_predisable().

Fixes: 2763ea0585 ("iio: adc: stm32: add optional dma support")

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Fabrice Gasnier 2019-10-25 17:04:20 +02:00 committed by Jonathan Cameron
parent 6e82ae6b8d
commit e6afcf6c59
1 changed files with 2 additions and 2 deletions
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4
drivers/iio/adc/stm32-adc.c
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@ -1399,7 +1399,7 @@ static int stm32_adc_dma_start(struct iio_dev *indio_dev)
cookie = dmaengine_submit(desc);
ret = dma_submit_error(cookie);
if (ret) {
dmaengine_terminate_all(adc->dma_chan);
dmaengine_terminate_sync(adc->dma_chan);
return ret;
}
@ -1477,7 +1477,7 @@ static void __stm32_adc_buffer_predisable(struct iio_dev *indio_dev)
stm32_adc_conv_irq_disable(adc);
if (adc->dma_chan)
dmaengine_terminate_all(adc->dma_chan);
dmaengine_terminate_sync(adc->dma_chan);
if (stm32_adc_set_trig(indio_dev, NULL))
dev_err(&indio_dev->dev, "Can't clear trigger\n");