linux-kernel - [RFC PATCH v1 8/9] net: ipconfig: Force fw_devlink to unblock any devices that might probe

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Date:   Thu, 26 May 2022 01:15:47 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        John Stultz <jstultz@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, iommu@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: [RFC PATCH v1 8/9] net: ipconfig: Force fw_devlink to unblock any
 devices that might probe

If there are network devices that could probe without some of their
suppliers probing and those network devices are needed for IP auto
config to work, then fw_devlink=on might break that usecase by blocking
the network devices from probing by the time IP auto config starts.

So, when IP auto config is enabled, make sure fw_devlink doesn't block
the probing of any device that has a driver by the time we get to IP
auto config.

Signed-off-by: Saravana Kannan <saravanak@...gle.com>
---
 net/ipv4/ipconfig.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index 9d41d5d5cd1e..aa7b8ba68ca6 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -1435,6 +1435,8 @@ static int __init wait_for_devices(void)
 {
 	int i;
 
+	fw_devlink_unblock_may_probe();
+
 	for (i = 0; i < DEVICE_WAIT_MAX; i++) {
 		struct net_device *dev;
 		int found = 0;
-- 
2.36.1.124.g0e6072fb45-goog