Re: [PATCH] thunderbolt: Notify userspace when boot_acl is changed

[Yehezkel Bernat]

On Mon, Jun 18, 2018 at 5:44 PM Mika Westerberg
<mika.westerberg@xxxxxxxxxxxxxxx> wrote:
>
> The commit 9aaa3b8b4c56 ("thunderbolt: Add support for preboot ACL")
> introduced boot_acl attribute but missed the fact that now userspace
> needs to poll the attribute constantly to find out whether it has
> changed or not. Fix this by sending notification to the userspace
> whenever the boot_acl attribute is changed.
>
> Fixes: 9aaa3b8b4c56 ("thunderbolt: Add support for preboot ACL")
> Reported-by: Christian Kellner <ckellner@xxxxxxxxxx>
> Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> ---
>  drivers/thunderbolt/domain.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c
> index 6281266b8ec0..a923ebdeb73c 100644
> --- a/drivers/thunderbolt/domain.c
> +++ b/drivers/thunderbolt/domain.c
> @@ -213,6 +213,10 @@ static ssize_t boot_acl_store(struct device *dev, struct device_attribute *attr,
>                 goto err_free_acl;
>         }
>         ret = tb->cm_ops->set_boot_acl(tb, acl, tb->nboot_acl);
> +       if (!ret) {
> +               /* Notify userspace about the change */
> +               kobject_uevent(&tb->dev.kobj, KOBJ_CHANGE);
> +       }
>         mutex_unlock(&tb->lock);
>
>  err_free_acl:
> --
> 2.17.1
>

Acked-by: Yehezkel Bernat <yehezkelshb@xxxxxxxxx>