Re: [PATCH] mdev: Send uevents around parent device registration

Kirti Wankhede
2019-06-26T17:53:16Z

On 6/26/2019 7:57 PM, Alex Williamson wrote:
> This allows udev to trigger rules when a parent device is registered
> or unregistered from mdev.
>
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
> ---
> drivers/vfio/mdev/mdev_core.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
> index ae23151442cb..ecec2a3b13cb 100644
> --- a/drivers/vfio/mdev/mdev_core.c
> +++ b/drivers/vfio/mdev/mdev_core.c
> @@ -146,6 +146,8 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
> {
> int ret;
> struct mdev_parent *parent;
> + char *env_string = "MDEV_STATE=registered";
> + char *envp[] = { env_string, NULL };
>
> /* check for mandatory ops */
> if (!ops || !ops->create || !ops->remove || !ops->supported_type_groups)
> @@ -196,7 +198,8 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
> list_add(&parent->next, &parent_list);
> mutex_unlock(&parent_list_lock);
>
> - dev_info(dev, "MDEV: Registered\n");
> + kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
> +

Its good to have udev event, but don't remove debug print from dmesg.
Same for unregister.

Thanks,
Kirti

> return 0;
>
> add_dev_err:
> @@ -220,6 +223,8 @@ EXPORT_SYMBOL(mdev_register_device);
> void mdev_unregister_device(struct device *dev)
> {
> struct mdev_parent *parent;
> + char *env_string = "MDEV_STATE=unregistered";
> + char *envp[] = { env_string, NULL };
>
> mutex_lock(&parent_list_lock);
> parent = __find_parent_device(dev);
> @@ -228,7 +233,6 @@ void mdev_unregister_device(struct device *dev)
> mutex_unlock(&parent_list_lock);
> return;
> }
> - dev_info(dev, "MDEV: Unregistering\n");
>
> list_del(&parent->next);
> mutex_unlock(&parent_list_lock);
> @@ -243,6 +247,8 @@ void mdev_unregister_device(struct device *dev)
> up_write(&parent->unreg_sem);
>
> mdev_put_parent(parent);
> +
> + kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
> }
> EXPORT_SYMBOL(mdev_unregister_device);
>
>