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@xxxxxxxxxxxxxxx
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> 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