linux-kernel - Re: [PATCH v2 1/2] driver: core: add dedicated workqueue for devlink removal

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Date: Mon, 5 Feb 2024 14:35:02 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: nuno.sa@...log.com
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Daniel Scally <djrscally@...il.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] driver: core: add dedicated workqueue for devlink
 removal

On Mon, Feb 05, 2024 at 01:09:32PM +0100, Nuno Sa via B4 Relay wrote:
> From: Nuno Sa <nuno.sa@...log.com>
> 
> Let's use a dedicated queue for devlinks since releasing a link happens
> asynchronously but some code paths, like DT overlays, have some
> expectations regarding the of_node when being removed (the refcount must
> be 1). Given how devlinks are released that cannot be assured. Hence, add a
> dedicated queue so that it's easy to sync against devlinks removal.
> 
> While at it, make sure to explicitly include <linux/workqueue.h>.

..

> +++ b/include/linux/fwnode.h
> @@ -213,5 +213,6 @@ extern bool fw_devlink_is_strict(void);
>  int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup);
>  void fwnode_links_purge(struct fwnode_handle *fwnode);
>  void fw_devlink_purge_absent_suppliers(struct fwnode_handle *fwnode);
> +void fwnode_links_flush_queue(void);

I am not sure if you have seen my comment against v1.

I find the namespace a bit messy for devlinks. And to me seems the best place
for this line is to be before fwnode_links_purge().

-- 
With Best Regards,
Andy Shevchenko