linux-kernel - Re: [PATCH v2 1/3] software node: Add software_node_find_by

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Message-ID: <CAHp75Vcp6JZ6jWT0dcbWXZYEJKz8Ps1TE-d8+haVni+g4DMnBA@mail.gmail.com>
Date:   Fri, 16 Aug 2019 16:42:45 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Darren Hart <dvhart@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] software node: Add software_node_find_by_name()

On Fri, Aug 16, 2019 at 1:45 PM Heikki Krogerus
<heikki.krogerus@...ux.intel.com> wrote:
>
> Function that searches software nodes by node name.
>

FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> Tested-by: Hans de Goede <hdegoede@...hat.com>
> ---
>  drivers/base/swnode.c    | 37 +++++++++++++++++++++++++++++++++++++
>  include/linux/property.h |  4 ++++
>  2 files changed, 41 insertions(+)
>
> diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
> index e7b3aa3bd55a..ee2a405cca9a 100644
> --- a/drivers/base/swnode.c
> +++ b/drivers/base/swnode.c
> @@ -620,6 +620,43 @@ static const struct fwnode_operations software_node_ops = {
>
>  /* -------------------------------------------------------------------------- */
>
> +/**
> + * software_node_find_by_name - Find software node by name
> + * @parent: Parent of the software node
> + * @name: Name of the software node
> + *
> + * The function will find a node that is child of @parent and that is named
> + * @name. If no node is found, the function returns NULL.
> + *
> + * NOTE: you will need to drop the reference with fwnode_handle_put() after use.
> + */
> +const struct software_node *
> +software_node_find_by_name(const struct software_node *parent, const char *name)
> +{
> +       struct swnode *swnode;
> +       struct kobject *k;
> +
> +       if (!name)
> +               return NULL;
> +
> +       spin_lock(&swnode_kset->list_lock);
> +
> +       list_for_each_entry(k, &swnode_kset->list, entry) {
> +               swnode = kobj_to_swnode(k);
> +               if (parent == swnode->node->parent && swnode->node->name &&
> +                   !strcmp(name, swnode->node->name)) {
> +                       kobject_get(&swnode->kobj);
> +                       break;
> +               }
> +               swnode = NULL;
> +       }
> +
> +       spin_unlock(&swnode_kset->list_lock);
> +
> +       return swnode ? swnode->node : NULL;
> +}
> +EXPORT_SYMBOL_GPL(software_node_find_by_name);
> +
>  static int
>  software_node_register_properties(struct software_node *node,
>                                   const struct property_entry *properties)
> diff --git a/include/linux/property.h b/include/linux/property.h
> index 5a910ad79591..9b3d4ca3a73a 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -421,6 +421,10 @@ bool is_software_node(const struct fwnode_handle *fwnode);
>  const struct software_node *to_software_node(struct fwnode_handle *fwnode);
>  struct fwnode_handle *software_node_fwnode(const struct software_node *node);
>
> +const struct software_node *
> +software_node_find_by_name(const struct software_node *parent,
> +                          const char *name);
> +
>  int software_node_register_nodes(const struct software_node *nodes);
>  void software_node_unregister_nodes(const struct software_node *nodes);
>
> --
> 2.23.0.rc1
>


-- 
With Best Regards,
Andy Shevchenko