linux-kernel - Re: [PATCH] extcon: intel-int3496: Fix oops on probe

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Date:   Mon, 12 Feb 2018 08:36:13 +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] extcon: intel-int3496: Fix oops on probe

On 2018년 02월 12일 08:26, Hans de Goede wrote:
> Commit 41d600274fbf ("extcon: int3496: process id-pin first so that we
> start with the right status") starts the work on the workqueue before
> registration to make sure we've a valid cable state directly after
> registration.
> 
> But that commit moves the queuing of the work to before we even alloc the
> extcon, causing a NULL pointer deref in the worker.
> 
> This commit moves the queuing of the work to after we alloc the extcon,
> fixing the NULL pointer deref.
> 
> Fixes: 41d600274fbf ("extcon: int3496: process id-pin first ...")
> Cc: stable@...r.kernel.org
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
>  drivers/extcon/extcon-intel-int3496.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-intel-int3496.c b/drivers/extcon/extcon-intel-int3496.c
> index b23ee9d993a3..673bb26a9a2a 100644
> --- a/drivers/extcon/extcon-intel-int3496.c
> +++ b/drivers/extcon/extcon-intel-int3496.c
> @@ -131,15 +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");
>  
> +	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 */
> -	data->edev = devm_extcon_dev_allocate(dev, int3496_cable);
> -	if (IS_ERR(data->edev))
> -		return -ENOMEM;
> -
>  	ret = devm_extcon_dev_register(dev, data->edev);
>  	if (ret < 0) {
>  		dev_err(dev, "can't register extcon device: %d\n", ret);
> 

Instead, You better to send v3 after merging your patch[1] and this patch.
[1] extcon: int3496: process id-pin first so that we start with the right status

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics