linux-kernel - Re: [PATCH v2] iio: magnetometer: ak8974: Fix runtime PM imbalance on error in ak8974

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Date:   Sun, 31 May 2020 16:06:11 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Dinghao Liu <dinghao.liu@....edu.cn>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-iio@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hartmut Knaack <knaack.h@....de>,
        Jonathan Cameron <jic23@...nel.org>, Kangjie Lu <kjlu@....edu>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>
Subject: Re: [PATCH v2] iio: magnetometer: ak8974: Fix runtime PM imbalance on
 error in ak8974_probe()

> When devm_regmap_init_i2c() returns an error code, a pairing
> runtime PM usage counter decrement is needed to keep the
> counter balanced.

How do you think about to replace the word “pairing” by “corresponding”?


> For error paths after ak8974_set_power(),
> ak8974_detect() and ak8974_reset(), things are the same.

Will an other wording become more helpful than this information?


> However, When iio_triggered_buffer_setup() returns an error
> code, there will be two PM usgae counter decrements.

Please avoid two typos in this sentence.


Would you like to add the tag “Fixes” to the commit message?


…
+++ b/drivers/iio/magnetometer/ak8974.c
…
@@ -854,7 +856,6 @@  static int ak8974_probe(struct i2c_client *i2c,
…

Can a source code variant like the following make sense
for a more complete exception handling?

power_off:
	ak8974_set_power(ak8974, AK8974_PWR_OFF);
put_pm:
	pm_runtime_put_noidle(&i2c->dev);
	pm_runtime_disable(&i2c->dev);
disable_regulator:
	regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
	return ret;


Regards,
Markus