netdev - Re: [PATCH net] net: bridge: start hello timer only if device is up

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Message-Id: <20170601.123124.646097227290806863.davem@davemloft.net>
Date:   Thu, 01 Jun 2017 12:31:24 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     nikolay@...ulusnetworks.com
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com,
        lucien.xin@...il.com, cera@...a.cz, sebott@...ux.vnet.ibm.com
Subject: Re: [PATCH net] net: bridge: start hello timer only if device is up

From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Date: Thu,  1 Jun 2017 18:07:55 +0300

> When the transition of NO_STP -> KERNEL_STP was fixed by always calling
> mod_timer in br_stp_start, it introduced a new regression which causes
> the timer to be armed even when the bridge is down, and since we stop
> the timers in its ndo_stop() function, they never get disabled if the
> device is destroyed before it's upped.
> 
> To reproduce:
> $ while :; do ip l add br0 type bridge hello_time 100; brctl stp br0 on;
> ip l del br0; done;
> 
> CC: Xin Long <lucien.xin@...il.com>
> CC: Ivan Vecera <cera@...a.cz>
> CC: Sebastian Ott <sebott@...ux.vnet.ibm.com>
> Reported-by: Sebastian Ott <sebott@...ux.vnet.ibm.com>
> Fixes: 6d18c732b95c ("bridge: start hello_timer when enabling KERNEL_STP in br_stp_start")
> Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>

Applied and queued up for -stable.