Hi Chanwoo,
On 01/04/15 10:23, Robert Baldyga wrote:
> IRQ handler touches info->edev, so if interrupt occurs before extcon
> device initialization it can cause NULL pointer dereference. Doing extcon
> initialization before IRQ handler registration fixes this problem.
>
> Signed-off-by: Robert Baldyga <r.baldyga@xxxxxxxxxxx>
> Acked-by: Roger Quadros <rogerq@xxxxxx>
Can you please pick this patch for 4.1 (or 4.1-rc) as it fixes a bug. Thanks.
cheers,
-roger
> ---
> drivers/extcon/extcon-usb-gpio.c | 24 ++++++++++++------------
> 1 file changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/extcon/extcon-usb-gpio.c b/drivers/extcon/extcon-usb-gpio.c
> index 3f0bad3..f6aa99d 100644
> --- a/drivers/extcon/extcon-usb-gpio.c
> +++ b/drivers/extcon/extcon-usb-gpio.c
> @@ -119,6 +119,18 @@ static int usb_extcon_probe(struct platform_device *pdev)
> return PTR_ERR(info->id_gpiod);
> }
>
> + info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
> + if (IS_ERR(info->edev)) {
> + dev_err(dev, "failed to allocate extcon device\n");
> + return -ENOMEM;
> + }
> +
> + ret = devm_extcon_dev_register(dev, info->edev);
> + if (ret < 0) {
> + dev_err(dev, "failed to register extcon device\n");
> + return ret;
> + }
> +
> ret = gpiod_set_debounce(info->id_gpiod,
> USB_GPIO_DEBOUNCE_MS * 1000);
> if (ret < 0)
> @@ -142,18 +154,6 @@ static int usb_extcon_probe(struct platform_device *pdev)
> return ret;
> }
>
> - info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
> - if (IS_ERR(info->edev)) {
> - dev_err(dev, "failed to allocate extcon device\n");
> - return -ENOMEM;
> - }
> -
> - ret = devm_extcon_dev_register(dev, info->edev);
> - if (ret < 0) {
> - dev_err(dev, "failed to register extcon device\n");
> - return ret;
> - }
> -
> platform_set_drvdata(pdev, info);
> device_init_wakeup(dev, 1);
>
>
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