Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        Sasha Levin <sashal@kernel.org>, linux-iio@vger.kernel.org
Subject: [PATCH AUTOSEL 5.12 018/104] iio: magn: bmc150: Balance runtime pm + use pm_runtime_resume_and_get()
Date:   Fri,  9 Jul 2021 22:20:30 -0400
Message-Id: <20210710022156.3168825-18-sashal@kernel.org>
In-Reply-To: <20210710022156.3168825-1-sashal@kernel.org>
References: <20210710022156.3168825-1-sashal@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

[ Upstream commit 264da512431495e542fcaf56ffe75e7df0e7db74 ]

probe() error paths after runtime pm is enabled, should disable it.
remove() should not call pm_runtime_put_noidle() as there is no
matching get() to have raised the reference count.  This case
has no affect a the runtime pm core protects against going negative.

Whilst here use pm_runtime_resume_and_get() to tidy things up a little.
coccicheck script didn't get this one due to complex code structure so
found by inspection.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/20210509113354.660190-12-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iio/magnetometer/bmc150_magn.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/magnetometer/bmc150_magn.c b/drivers/iio/magnetometer/bmc150_magn.c
index b2f3129e1b4f..03d25c725533 100644
--- a/drivers/iio/magnetometer/bmc150_magn.c
+++ b/drivers/iio/magnetometer/bmc150_magn.c
@@ -262,7 +262,7 @@ static int bmc150_magn_set_power_state(struct bmc150_magn_data *data, bool on)
 	int ret;
 
 	if (on) {
-		ret = pm_runtime_get_sync(data->dev);
+		ret = pm_runtime_resume_and_get(data->dev);
 	} else {
 		pm_runtime_mark_last_busy(data->dev);
 		ret = pm_runtime_put_autosuspend(data->dev);
@@ -271,9 +271,6 @@ static int bmc150_magn_set_power_state(struct bmc150_magn_data *data, bool on)
 	if (ret < 0) {
 		dev_err(data->dev,
 			"failed to change power state to %d\n", on);
-		if (on)
-			pm_runtime_put_noidle(data->dev);
-
 		return ret;
 	}
 #endif
@@ -964,12 +961,14 @@ int bmc150_magn_probe(struct device *dev, struct regmap *regmap,
 	ret = iio_device_register(indio_dev);
 	if (ret < 0) {
 		dev_err(dev, "unable to register iio device\n");
-		goto err_buffer_cleanup;
+		goto err_disable_runtime_pm;
 	}
 
 	dev_dbg(dev, "Registered device %s\n", name);
 	return 0;
 
+err_disable_runtime_pm:
+	pm_runtime_disable(dev);
 err_buffer_cleanup:
 	iio_triggered_buffer_cleanup(indio_dev);
 err_free_irq:
@@ -993,7 +992,6 @@ int bmc150_magn_remove(struct device *dev)
 
 	pm_runtime_disable(dev);
 	pm_runtime_set_suspended(dev);
-	pm_runtime_put_noidle(dev);
 
 	iio_triggered_buffer_cleanup(indio_dev);
 
-- 
2.30.2