linux-kernel - Re: [PATCH v3 3/3] extcon: int3496: process id-pin first so that we start with the right status

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Message-id: <5A820C33.5000209@samsung.com>
Date:   Tue, 13 Feb 2018 06:50:43 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Hans de Goede <hdegoede@...hat.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v3 3/3] extcon: int3496: process id-pin first so that we
 start with the right status

On 2018년 02월 13일 04:46, Hans de Goede wrote:
> Some other drivers may be waiting for our extcon to show-up (exiting their
> probe methods with -EPROBE_DEFER until we show up).
> 
> These drivers will typically get the cable state directly after getting
> the extcon, this commit changes the int3496 code to process the id-pin
> before registering the extcon, so that other drivers see the correct state
> right away.
> 
> Fixes: 2f556bdb9f2e ("extcon: int3496: Add Intel INT3496 ACPI ... driver")
> Cc: stable@...r.kernel.org
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
> Changes in v2:
> -Add Fixes tag
> 
> Changes in v3:
> -Fix oops on probe by scheduling the work too early
> ---
>  drivers/extcon/extcon-intel-int3496.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-intel-int3496.c b/drivers/extcon/extcon-intel-int3496.c
> index c8691b5a9cb0..673bb26a9a2a 100644
> --- a/drivers/extcon/extcon-intel-int3496.c
> +++ b/drivers/extcon/extcon-intel-int3496.c
> @@ -131,11 +131,15 @@ static int int3496_probe(struct platform_device *pdev)
>  	if (IS_ERR(data->gpio_usb_mux))
>  		dev_info(dev, "can't request USB MUX GPIO\n");
>  
> -	/* register extcon device */
>  	data->edev = devm_extcon_dev_allocate(dev, int3496_cable);
>  	if (IS_ERR(data->edev))
>  		return -ENOMEM;
>  
> +	/* process id-pin first so that we start with the right status */
> +	queue_delayed_work(system_wq, &data->work, 0);
> +	flush_delayed_work(&data->work);
> +
> +	/* register extcon device */
>  	ret = devm_extcon_dev_register(dev, data->edev);
>  	if (ret < 0) {
>  		dev_err(dev, "can't register extcon device: %d\n", ret);
> @@ -153,9 +157,6 @@ static int int3496_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	/* queue initial processing of id-pin */
> -	queue_delayed_work(system_wq, &data->work, 0);
> -
>  	platform_set_drvdata(pdev, data);
>  
>  	return 0;
> 

Applied it.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics