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%3Ba=su...

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