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

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Message-ID: <CACRpkdZi=UaGES_bupj_fQB+sPj5zOvONdCn7_Rs_j9mcukAAQ@mail.gmail.com>
Date:   Tue, 26 May 2020 13:13:56 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     Kangjie Lu <kjlu@....edu>, Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [v2] iio: magnetometer: ak8974: Fix runtime PM imbalance
 on error

On Tue, May 26, 2020 at 12:47 PM Dinghao Liu <dinghao.liu@....edu.cn> wrote:

> 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@....edu.cn>
> ---
>
> Changelog:
>
> v2: - Change 3 goto targets from "power_off" to
>       "disabel_pm". Remove unused lable "power_off".
>       Move 3 PM runtime related calls to the end of
>       the function.

Thanks for fixing this Dinghao!
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij