linux-kernel - Re: [PATCH] HID: hidraw: fix power sequence when closing device

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Message-ID: <CABXOdTewO038WH89vG+Kw9UT+xBu9hgPViLVveWkr6SrnekjNw@mail.gmail.com>
Date:   Tue, 19 Sep 2017 18:45:46 -0700
From:   Guenter Roeck <groeck@...gle.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Benson Leung <bleung@...omium.org>,
        Oliver Neukum <oneukum@...e.com>,
        Guenter Roeck <groeck@...omium.org>,
        linux-input@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] HID: hidraw: fix power sequence when closing device

On Tue, Sep 19, 2017 at 6:37 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> We should not try to bring HID device out of full power state before
> calling hid_hw_close(), so that transport driver operates on powered up
> device (making this inverse of the opening sequence).
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

Reviewed-by: Guenter Roeck <groeck@...omium.org>

> ---
>  drivers/hid/hidraw.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
> index ec530454e6f6..5fbe0f81ab2e 100644
> --- a/drivers/hid/hidraw.c
> +++ b/drivers/hid/hidraw.c
> @@ -337,8 +337,8 @@ static void drop_ref(struct hidraw *hidraw, int exists_bit)
>                         kfree(hidraw);
>                 } else {
>                         /* close device for last reader */
> -                       hid_hw_power(hidraw->hid, PM_HINT_NORMAL);
>                         hid_hw_close(hidraw->hid);
> +                       hid_hw_power(hidraw->hid, PM_HINT_NORMAL);
>                 }
>         }
>  }
> --
> 2.14.1.821.g8fa685d3b7-goog
>
>
> --
> Dmitry