linux-kernel - Re: [PATCH v3 2/3] driver core: fw_devlink: Add support for FWNODE_FLAG_NEEDS_CHILD_BOUND_ON

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Message-ID: <YUsnKX1pYc9K8f95@lunn.ch>
Date:   Wed, 22 Sep 2021 14:52:57 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Len Brown <lenb@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Vladimir Oltean <olteanv@...il.com>,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] driver core: fw_devlink: Add support for
 FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD

> That goes back to Rafael's reply (and I agree):
> 
> "Also if the probe has already started, it may still return
> -EPROBE_DEFER at any time in theory, so as a rule the dependency is
> actually known to be satisfied when the probe has successfully
> completed."
> 
> So waiting for the probe to finish is the right behavior/intentional
> for fw_devlink.

But differs to how things actually work in the driver model. The
driver model does not care if a driver has finished probing, you can
use a resource as soon as it is registered. Hence this whole
problem/discussion.

	Andrew