[PATCH linux dev-4.7 v2] drivers/fsi: Don't scan after fsi-gpio_master unbound

[Joel Stanley]

On Fri, Mar 3, 2017 at 7:45 AM, Christopher Bostic
<cbostic at linux.vnet.ibm.com> wrote:
> Check pointers prior to scanning master in the sysfs scan
> file.  These get invalidated after an unbind operation.
>
> Signed-off-by: Christopher Bostic <cbostic at linux.vnet.ibm.com>
> ---
> v2:
>     Return error if invalid pointers passed in.

Thanks, I think this is better.

Applied to dev-4.7.

Cheers,

Joel

> ---
>  drivers/fsi/fsi-master-gpio.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c
> index c5f4f9c..49f3399 100644
> --- a/drivers/fsi/fsi-master-gpio.c
> +++ b/drivers/fsi/fsi-master-gpio.c
> @@ -476,7 +476,14 @@ static ssize_t store_scan(struct device *dev,
>                                 const char *buf,
>                                 size_t count)
>  {
> -       struct fsi_master_gpio *master = dev_get_drvdata(dev);
> +       struct fsi_master_gpio *master;
> +
> +       if (!dev)
> +               return -EINVAL;
> +
> +       master = dev_get_drvdata(dev);
> +       if (!master)
> +               return -EINVAL;
>
>         fsi_master_gpio_init(master);
>
> --
> 1.8.2.2
>