[PATCH] PCI: exynos: fix the potential null pointer dereference

[Lorenzo Pieralisi]

On Mon, Jan 22, 2018 at 11:28:54AM +0900, Jaehoon Chung wrote:
> Before calling the callback function, it needs to check whether
> init_clk_resources is assigned or not.
> Otherwise, it can be occurred the NULL pointer dereference when
> init_clk_resources is not assigned.
> 
> Even though init_clk_resources is assigned now, it needs to prevent the
> potential NULL pointer dereference in future.
> 
> Signed-off-by: Jaehoon Chung <jh80.chung at samsung.com>
> ---
>  drivers/pci/dwc/pci-exynos.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/dwc/pci-exynos.c b/drivers/pci/dwc/pci-exynos.c
> index 56f32aeebd0a..39f08881f9a4 100644
> --- a/drivers/pci/dwc/pci-exynos.c
> +++ b/drivers/pci/dwc/pci-exynos.c
> @@ -499,7 +499,8 @@ static int __init exynos_pcie_probe(struct platform_device *pdev)
>  			return ret;
>  	}
>  
> -	if (ep->ops && ep->ops->get_clk_resources) {
> +	if (ep->ops && ep->ops->get_clk_resources &&
> +			ep->ops->init_clk_resources) {
>  		ret = ep->ops->get_clk_resources(ep);
>  		if (ret)
>  			return ret;
> -- 
> 2.15.1

I applied it to pci/dwc for 4.16.

Thanks,
Lorenzo