[1/1] usb: chipidea: fix static checker warning for NULL pointer

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Thu, Jan 17, 2019 at 09:24:20AM +0000, Peter Chen wrote:
> During the static checker, "data->usbmisc_data" may be NULL.

I can not quite parse this sentance.  Do you mean that a static checker
found this issue?

> Fix it by adding this pointer judgement before using.
> 
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Peter Chen <peter.chen@nxp.com>
> ---
>  drivers/usb/chipidea/ci_hdrc_imx.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
> index e81de9ca8729..9b45aa422e69 100644
> --- a/drivers/usb/chipidea/ci_hdrc_imx.c
> +++ b/drivers/usb/chipidea/ci_hdrc_imx.c
> @@ -316,7 +316,8 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
>  	if (IS_ERR(data->usbmisc_data))
>  		return PTR_ERR(data->usbmisc_data);
>  
> -	if (of_usb_get_phy_mode(dev->of_node) == USBPHY_INTERFACE_MODE_HSIC) {
> +	if ((of_usb_get_phy_mode(dev->of_node) == USBPHY_INTERFACE_MODE_HSIC)
> +		&& data->usbmisc_data) {

Are you sure that is correct?  If usbmisc_data is NULL, then you just
took out a bunch of checking and lookups.  Don't you normally need to do
this even if that pointer is NULL?

Will the rest of the function still work properly if that is the case?

thanks,

greg k-h