linux-kernel - Re: [PATCH v6 2/5] device property: Introduce fwnode_for_each_parent

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Date:   Fri, 29 Apr 2022 16:45:48 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Rob Herring <robh@...nel.org>, linux-acpi@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Len Brown <lenb@...nel.org>
Subject: Re: [PATCH v6 2/5] device property: Introduce fwnode_for_each_parent_node()

Hi,

On Fri, Apr 8, 2022 at 11:50 AM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> In a few cases the functionality of fwnode_for_each_parent_node()
> is already in use. Introduce a common helper macro for it.
>
> It may be used by others as well in the future.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Reviewed-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> ---
> v6: added tag (Sakari)
>  drivers/base/property.c  | 56 +++++++++++++++++++++-------------------
>  include/linux/property.h |  9 +++++--
>  2 files changed, 36 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/base/property.c b/drivers/base/property.c
> index 6ecc1398b0ba..f0ac31d28798 100644
> --- a/drivers/base/property.c
> +++ b/drivers/base/property.c
> @@ -596,17 +596,17 @@ EXPORT_SYMBOL_GPL(fwnode_get_next_parent);
>   */
>  struct device *fwnode_get_next_parent_dev(struct fwnode_handle *fwnode)
>  {
> +       struct fwnode_handle *parent;
>         struct device *dev;
>
> -       fwnode_handle_get(fwnode);
> -       do {
> -               fwnode = fwnode_get_next_parent(fwnode);
> -               if (!fwnode)
> -                       return NULL;
> +       fwnode_for_each_parent_node(fwnode, parent) {
>                 dev = get_dev_from_fwnode(fwnode);

Breadcrumbs in case anyone else ends up at this patch due to a bisect,
like I just did. The above should have been changed to
"get_dev_from_fwnode(parent);" in this patch. Fix posted at:

https://lore.kernel.org/r/20220429164325.1.I2a3b980ea051e59140227999f0f0ca16f1125768@changeid