patch "iio: adc: ad_sigma_delta: do not use internal iio_dev lock" added to char-misc-testing

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

iio: adc: ad_sigma_delta: do not use internal iio_dev lock

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-testing 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 be merged to the char-misc-next branch sometime soon, after it passes testing, and the merge window is open.

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

From 20228a1d5a55e7db0c6720840f2c7d2b48c55f69 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nuno=20S=C3=A1?= <[email protected]>
Date: Tue, 20 Sep 2022 13:28:07 +0200
Subject: iio: adc: ad_sigma_delta: do not use internal iio_dev lock
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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Drop 'mlock' usage by making use of iio_device_claim_direct_mode(). This change actually makes sure we cannot do a single conversion while buffering is enable. Note there was a potential race in the previous code since we were only acquiring the lock after checking if the bus is enabled.

---
 drivers/iio/adc/ad_sigma_delta.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

index 261a9a6b45e1..d8570f620785 100644
@@ -281,10 +281,10 @@ int ad_sigma_delta_single_conversion(struct iio_dev *indio_dev,
 	unsigned int data_reg;
 	int ret = 0;
 
-	if (iio_buffer_enabled(indio_dev))
-		return -EBUSY;
+	ret = iio_device_claim_direct_mode(indio_dev);
+	if (ret)
+		return ret;
 
-	mutex_lock(&indio_dev->mlock);
 	ad_sigma_delta_set_channel(sigma_delta, chan->address);
 
 	spi_bus_lock(sigma_delta->spi->master);

@@ -323,7 +323,7 @@ int ad_sigma_delta_single_conversion(struct iio_dev *indio_dev,
 	ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_IDLE);
 	sigma_delta->bus_locked = false;
 	spi_bus_unlock(sigma_delta->spi->master);
-	mutex_unlock(&indio_dev->mlock);
+	iio_device_release_direct_mode(indio_dev);
 
 	if (ret)
 		return ret;

2.38.1