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

iio: light: rpr0521 poweroff for probe fails

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-light-rpr0521-poweroff-for-probe-fails.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 Mon Apr 9 17:09:24 CEST 2018

From: Mikko Koivunen mikko.koivunen@fi.rohmeurope.com Date: Thu, 18 May 2017 15:12:50 +0300 Subject: iio: light: rpr0521 poweroff for probe fails

From: Mikko Koivunen mikko.koivunen@fi.rohmeurope.com

[ Upstream commit 12d74949133e2450533894ea01ce0c56646ce006 ]

Set sensor measurement off after probe fail in pm_runtime_set_active() or iio_device_register(). Without this change sensor measurement stays on even though probe fails on these calls.

This is maybe rare case, but causes constant power drain without any benefits when it happens. Power drain is 20-500uA, typically 180uA.

Signed-off-by: Mikko Koivunen mikko.koivunen@fi.rohmeurope.com Acked-by: Daniel Baluta daniel.baluta@nxp.com Signed-off-by: Jonathan Cameron jic23@kernel.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iio/light/rpr0521.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)

--- a/drivers/iio/light/rpr0521.c +++ b/drivers/iio/light/rpr0521.c @@ -510,13 +510,26 @@ static int rpr0521_probe(struct i2c_clie

ret = pm_runtime_set_active(&client->dev); if (ret < 0) - return ret; + goto err_poweroff;

pm_runtime_enable(&client->dev); pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS); pm_runtime_use_autosuspend(&client->dev);

- return iio_device_register(indio_dev); + ret = iio_device_register(indio_dev); + if (ret) + goto err_pm_disable; + + return 0; + +err_pm_disable: + pm_runtime_disable(&client->dev); + pm_runtime_set_suspended(&client->dev); + pm_runtime_put_noidle(&client->dev); +err_poweroff: + rpr0521_poweroff(data); + + return ret; }

static int rpr0521_remove(struct i2c_client *client)

Patches currently in stable-queue which might be from mikko.koivunen@fi.rohmeurope.com are

queue-4.9/iio-light-rpr0521-poweroff-for-probe-fails.patch