linux-kernel - [PATCH 4.9 085/310] iio: light: rpr0521 poweroff for probe fails

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Date:   Wed, 11 Apr 2018 20:33:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Mikko Koivunen <mikko.koivunen@...rohmeurope.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Jonathan Cameron <jic23@...nel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 085/310] iio: light: rpr0521 poweroff for probe fails

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mikko Koivunen <mikko.koivunen@...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@...rohmeurope.com>
Acked-by: Daniel Baluta <daniel.baluta@....com>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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)