linux-kernel - [PATCH] Revert "net: linkwatch: add check for netdevice being present to linkwatch_do

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Date:   Tue,  1 Sep 2020 17:02:37 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Gaku Inami <gaku.inami.xh@...esas.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] Revert "net: linkwatch: add check for netdevice being present to linkwatch_do_dev"

This reverts commit 124eee3f6955f7aa19b9e6ff5c9b6d37cb3d1e2c.

Inami-san reported that this commit breaks bridge support in a Xen
environment, and that reverting it fixes this.

During system resume, bridge ports are no longer enabled, as that relies
on the receipt of the NETDEV_CHANGE notification.  This notification is
not sent, as netdev_state_change() is no longer called.

Note that the condition this commit intended to fix never existed
upstream, as the patch triggering it and referenced in the commit was
never applied upstream.  Hence I can confirm s2ram on r8a73a4/ape6evm
and sh73a0/kzm9g works fine before/after this revert.

Reported-by Gaku Inami <gaku.inami.xh@...esas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 net/core/link_watch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/link_watch.c b/net/core/link_watch.c
index 75431ca9300fb9c4..c24574493ecf95e6 100644
--- a/net/core/link_watch.c
+++ b/net/core/link_watch.c
@@ -158,7 +158,7 @@ static void linkwatch_do_dev(struct net_device *dev)
 	clear_bit(__LINK_STATE_LINKWATCH_PENDING, &dev->state);

 	rfc2863_policy(dev);
-	if (dev->flags & IFF_UP && netif_device_present(dev)) {
+	if (dev->flags & IFF_UP) {
 		if (netif_carrier_ok(dev))
 			dev_activate(dev);
 		else
-- 
2.17.1