[PATCH] soc: fsl: qe: gpio: Fix an error code in qe_pin_request()

[Li Yang]

On Fri, May 3, 2019 at 8:19 AM Dan Carpenter <dan.carpenter at oracle.com> wrote:
>
> There was a missing error code in this path.  It meant that we returned
> ERR_PTR(0) which is NULL and would result in a NULL dereference in the
> caller.

Thanks Dan.  An early version of this patch has been included in a
pending pull request to arm-soc.
https://lkml.org/lkml/2019/5/1/506


>
> Fixes: 1a2d397a6eb5 ("gpio/powerpc: Eliminate duplication of of_get_named_gpio_flags()")
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
> ---
>  drivers/soc/fsl/qe/gpio.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/soc/fsl/qe/gpio.c b/drivers/soc/fsl/qe/gpio.c
> index 819bed0f5667..51b3a47b5a55 100644
> --- a/drivers/soc/fsl/qe/gpio.c
> +++ b/drivers/soc/fsl/qe/gpio.c
> @@ -179,8 +179,10 @@ struct qe_pin *qe_pin_request(struct device_node *np, int index)
>         if (err < 0)
>                 goto err0;
>         gc = gpio_to_chip(err);
> -       if (WARN_ON(!gc))
> +       if (WARN_ON(!gc)) {
> +               err = -ENODEV;
>                 goto err0;
> +       }
>
>         if (!of_device_is_compatible(gc->of_node, "fsl,mpc8323-qe-pario-bank")) {
>                 pr_debug("%s: tried to get a non-qe pin\n", __func__);
> --
> 2.18.0
>