[PATCH 5.4 015/149] iio: magn: bmc150: Balance runtime pm + use pm_runtime_resume_and_get()

Greg Kroah-Hartman
2021-07-19T16:42:56Z

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 48685d785c1b..087dc16c2185 100644
--- a/drivers/iio/magnetometer/bmc150_magn.c
+++ b/drivers/iio/magnetometer/bmc150_magn.c
@@ -263,7 +263,7 @@ 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);
@@ -272,9 +272,6 @@ 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
@@ -947,12 +944,14 @@ 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:
@@ -976,7 +975,6 @@ 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