linux-kernel - Re: [PATCH RFC 4/7] bridge: cfm: Kernel space implementation of CFM.

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Message-ID: <20200915085137.c7xfmk5bpjzniclp@soft-test08>
Date:   Tue, 15 Sep 2020 08:51:37 +0000
From:   Henrik Bjoernlund <henrik.bjoernlund@...rochip.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     <davem@...emloft.net>, <roopa@...dia.com>, <nikolay@...dia.com>,
        <jiri@...lanox.com>, <idosch@...lanox.com>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <bridge@...ts.linux-foundation.org>,
        <UNGLinuxDriver@...rochip.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: Re: [PATCH RFC 4/7] bridge: cfm: Kernel space implementation of CFM.

Thanks for the review. Comments below.

The 09/04/2020 08:02, Jakub Kicinski wrote:
> 
> On Fri, 4 Sep 2020 09:15:24 +0000 Henrik Bjoernlund wrote:
> > +     rcu_read_lock();
> > +     b_port = rcu_dereference(mep->b_port);
> > +     if (!b_port)
> > +             return NULL;
> > +     skb = dev_alloc_skb(CFM_CCM_MAX_FRAME_LENGTH);
> > +     if (!skb)
> > +             return NULL;
> 
> net/bridge/br_cfm.c:171:23: warning: context imbalance in 'ccm_frame_build' - different lock contexts for basic block

I will assure that rcu_read_unlock() is called before any return.

-- 
/Henrik