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

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Date:   Thu, 03 Sep 2020 14:58:24 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     geert+renesas@...der.be
Cc:     hkallweit1@...il.com, f.fainelli@...il.com, andrew@...n.ch,
        kuba@...nel.org, gaku.inami.xh@...esas.com,
        yoshihiro.shimoda.uh@...esas.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "net: linkwatch: add check for netdevice being
 present to linkwatch_do_dev"

From: Geert Uytterhoeven <geert+renesas@...der.be>
Date: Tue,  1 Sep 2020 17:02:37 +0200

> This reverts commit 124eee3f6955f7aa19b9e6ff5c9b6d37cb3d1e2c.

Heiner, please review this.

Thank you.

> 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
>