linux-kernel - [PATCH] iio: gyro: bmg160: Fix error handling in bmg160_core

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Message-Id: <20220105125633.21989-1-linmq006@gmail.com>
Date:   Wed,  5 Jan 2022 12:56:30 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linmq006@...il.com, Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandru Ardelean <ardeleanalex@...il.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Gwendal Grignou <gwendal@...omium.org>,
        Adriana Reus <adi.reus@...il.com>, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] iio: gyro: bmg160: Fix error handling in bmg160_core_probe

The pm_runtime_enable will increase power disable depth.
If the probe fails, we should use pm_runtime_disable() to balance
pm_runtime_enable(). In the PM Runtime docs:
    Drivers in ->remove() callback should undo the runtime PM changes done
    in ->probe(). Usually this means calling pm_runtime_disable(),
    pm_runtime_dont_use_autosuspend() etc.
We should do this in error handling.

Fixes: 7d0ead5 ("iio: Reconcile operation order between iio_register/unregister and pm functions")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/iio/gyro/bmg160_core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/gyro/bmg160_core.c b/drivers/iio/gyro/bmg160_core.c
index 17b939a367ad..81a6d09788bd 100644
--- a/drivers/iio/gyro/bmg160_core.c
+++ b/drivers/iio/gyro/bmg160_core.c
@@ -1188,11 +1188,14 @@ int bmg160_core_probe(struct device *dev, struct regmap *regmap, int irq,
 	ret = iio_device_register(indio_dev);
 	if (ret < 0) {
 		dev_err(dev, "unable to register iio device\n");
-		goto err_buffer_cleanup;
+		goto err_pm_cleanup;
 	}
 
 	return 0;
 
+err_pm_cleanup:
+	pm_runtime_dont_use_autosuspend(dev);
+	pm_runtime_disable(dev);
 err_buffer_cleanup:
 	iio_triggered_buffer_cleanup(indio_dev);
 err_trigger_unregister:
-- 
2.17.1