From: Dinghao Liu dinghao.liu@zju.edu.cn
commit 0187294d227dfc42889e1da8f8ce1e44fc25f147 upstream.
When devm_regmap_init_i2c() returns an error code, a pairing runtime PM usage counter decrement is needed to keep the counter balanced. For error paths after ak8974_set_power(), ak8974_detect() and ak8974_reset(), things are the same.
However, When iio_triggered_buffer_setup() returns an error code, there will be two PM usgae counter decrements.
Signed-off-by: Dinghao Liu dinghao.liu@zju.edu.cn Fixes: 7c94a8b2ee8c ("iio: magn: add a driver for AK8974") Reviewed-by: Linus Walleij linus.walleij@linaro.org Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/iio/magnetometer/ak8974.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-)
--- a/drivers/iio/magnetometer/ak8974.c +++ b/drivers/iio/magnetometer/ak8974.c @@ -675,19 +675,21 @@ static int ak8974_probe(struct i2c_clien ak8974->map = devm_regmap_init_i2c(i2c, &ak8974_regmap_config); if (IS_ERR(ak8974->map)) { dev_err(&i2c->dev, "failed to allocate register map\n"); + pm_runtime_put_noidle(&i2c->dev); + pm_runtime_disable(&i2c->dev); return PTR_ERR(ak8974->map); }
ret = ak8974_set_power(ak8974, AK8974_PWR_ON); if (ret) { dev_err(&i2c->dev, "could not power on\n"); - goto power_off; + goto disable_pm; }
ret = ak8974_detect(ak8974); if (ret) { dev_err(&i2c->dev, "neither AK8974 nor AMI305 found\n"); - goto power_off; + goto disable_pm; }
ret = ak8974_selftest(ak8974); @@ -697,14 +699,9 @@ static int ak8974_probe(struct i2c_clien ret = ak8974_reset(ak8974); if (ret) { dev_err(&i2c->dev, "AK8974 reset failed\n"); - goto power_off; + goto disable_pm; }
- pm_runtime_set_autosuspend_delay(&i2c->dev, - AK8974_AUTOSUSPEND_DELAY); - pm_runtime_use_autosuspend(&i2c->dev); - pm_runtime_put(&i2c->dev); - indio_dev->dev.parent = &i2c->dev; indio_dev->channels = ak8974_channels; indio_dev->num_channels = ARRAY_SIZE(ak8974_channels); @@ -757,6 +754,11 @@ no_irq: goto cleanup_buffer; }
+ pm_runtime_set_autosuspend_delay(&i2c->dev, + AK8974_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(&i2c->dev); + pm_runtime_put(&i2c->dev); + return 0;
cleanup_buffer: @@ -765,7 +767,6 @@ disable_pm: pm_runtime_put_noidle(&i2c->dev); pm_runtime_disable(&i2c->dev); ak8974_set_power(ak8974, AK8974_PWR_OFF); -power_off: regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
return ret;