Patch "iio: pressure: ms5611: claim direct mode during oversampling changes" has been added to the 4.9-stable tree

Patch "iio: pressure: ms5611: claim direct mode during oversampling changes" has been added to the 4.9-stable tree

[gregkh]

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

    iio: pressure: ms5611: claim direct mode during oversampling changes

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     iio-pressure-ms5611-claim-direct-mode-during-oversampling-changes.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Nov  9 09:48:01 CET 2017
From: Alison Schofield <amsfield22@gmail.com>
Date: Fri, 20 Jan 2017 12:22:58 -0800
Subject: iio: pressure: ms5611: claim direct mode during oversampling changes

From: Alison Schofield <amsfield22@gmail.com>


[ Upstream commit 3bc1abcddb24f55b9c251e03caa4f9bd22ff748b ]

Driver was checking for direct mode before changing oversampling
ratios, but was not locking it.  Use the claim/release helper
functions to guarantee the device stays in direct mode while the
oversampling ratios are being updated.  Continue to use the drivers
private state lock to protect against conflicting direct mode access
of the state data.

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/iio/pressure/ms5611_core.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

--- a/drivers/iio/pressure/ms5611_core.c
+++ b/drivers/iio/pressure/ms5611_core.c
@@ -308,6 +308,7 @@ static int ms5611_write_raw(struct iio_d
 {
 	struct ms5611_state *st = iio_priv(indio_dev);
 	const struct ms5611_osr *osr = NULL;
+	int ret;
 
 	if (mask != IIO_CHAN_INFO_OVERSAMPLING_RATIO)
 		return -EINVAL;
@@ -321,12 +322,11 @@ static int ms5611_write_raw(struct iio_d
 	if (!osr)
 		return -EINVAL;
 
-	mutex_lock(&st->lock);
+	ret = iio_device_claim_direct_mode(indio_dev);
+	if (ret)
+		return ret;
 
-	if (iio_buffer_enabled(indio_dev)) {
-		mutex_unlock(&st->lock);
-		return -EBUSY;
-	}
+	mutex_lock(&st->lock);
 
 	if (chan->type == IIO_TEMP)
 		st->temp_osr = osr;
@@ -334,6 +334,8 @@ static int ms5611_write_raw(struct iio_d
 		st->pressure_osr = osr;
 
 	mutex_unlock(&st->lock);
+	iio_device_release_direct_mode(indio_dev);
+
 	return 0;
 }
 


Patches currently in stable-queue which might be from amsfield22@gmail.com are

queue-4.9/iio-pressure-ms5611-claim-direct-mode-during-oversampling-changes.patch
queue-4.9/iio-proximity-sx9500-claim-direct-mode-during-raw-proximity-reads.patch
queue-4.9/iio-magnetometer-mag3110-claim-direct-mode-during-raw-writes.patch
queue-4.9/iio-trigger-free-trigger-resource-correctly.patch