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authorFabrice Gasnier <fabrice.gasnier@st.com>2019-10-25 18:04:20 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2019-10-27 18:57:19 +0300
commite6afcf6c598d6f3a0c9c408bfeddb3f5730608b0 (patch)
treea61f1f1176910bb0d5b17fbe75d333738b379bba /drivers/iio
parent6e82ae6b8d11b948b74e71396efd8e074c415f44 (diff)
downloadlinux-e6afcf6c598d6f3a0c9c408bfeddb3f5730608b0.tar.xz
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: 2763ea0585c9 ("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>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/adc/stm32-adc.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index 663f8a5012d6..73aee5949b6b 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -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");