From: Jonathan Cameron Jonathan.Cameron@huawei.com
stable inclusion from stable-5.10.52 commit 1b1d6aa1a8cf924d31b8941f3dbd7f75b21f2768 bugzilla: 175542 https://gitee.com/openeuler/kernel/issues/I4DTKU
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ 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 Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- 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 8042175275d0..8eacfaf584cf 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 @@ -944,12 +941,14 @@ 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: @@ -973,7 +972,6 @@ 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);