netdev - Re: [PATCH net] bridge: start hello_timer when enabling KERNEL_STP in br_stp

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Date:   Sun, 21 May 2017 13:34:16 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, nikolay@...ulusnetworks.com, cera@...a.cz
Subject: Re: [PATCH net] bridge: start hello_timer when enabling KERNEL_STP
 in br_stp_start

From: Xin Long <lucien.xin@...il.com>
Date: Fri, 19 May 2017 22:20:29 +0800

> Since commit 76b91c32dd86 ("bridge: stp: when using userspace stp stop
> kernel hello and hold timers"), bridge would not start hello_timer if
> stp_enabled is not KERNEL_STP when br_dev_open.
> 
> The problem is even if users set stp_enabled with KERNEL_STP later,
> the timer will still not be started. It causes that KERNEL_STP can
> not really work. Users have to re-ifup the bridge to avoid this.
> 
> This patch is to fix it by starting br->hello_timer when enabling
> KERNEL_STP in br_stp_start.
> 
> As an improvement, it's also to start hello_timer again only when
> br->stp_enabled is KERNEL_STP in br_hello_timer_expired, there is
> no reason to start the timer again when it's NO_STP.
> 
> Fixes: 76b91c32dd86 ("bridge: stp: when using userspace stp stop kernel hello and hold timers")
> Reported-by: Haidong Li <haili@...hat.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied and queued up for -stable, thanks.