patch "iio: adc: stm32-adc: fix stopping dma" added to staging-linus

This is a note to let you know that I've just added the patch titled

iio: adc: stm32-adc: fix stopping dma

to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From e6afcf6c598d6f3a0c9c408bfeddb3f5730608b0 Mon Sep 17 00:00:00 2001
From: Fabrice Gasnier <[email protected]>
Date: Fri, 25 Oct 2019 17:04:20 +0200
Subject: 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().

---
 drivers/iio/adc/stm32-adc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 663f8a5012d6..73aee5949b6b 100644
@@ -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");

2.23.0