netdev - Re: [PATCH net-next 03/11] net: dsa: simplify tree reference counting

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Message-ID: <b412674e-5404-dac8-87e6-e9fafe6d0268@gmail.com>
Date:   Fri, 3 Nov 2017 16:16:05 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next 03/11] net: dsa: simplify tree reference counting

On 11/03/2017 04:05 PM, Vivien Didelot wrote:
> DSA trees have a refcount used to automatically free the dsa_switch_tree
> structure once there is no switch devices inside of it.
> 
> The refcount is incremented when a switch is added to the tree, and
> decremented when it is removed from it.
> 
> But because of kref_init, the refcount is also incremented at
> initialization, and when looking up the tree from the list for symmetry.
> 
> Thus the current code stores the number of switches plus one, and makes
> the switch registration more complex.
> 
> To simplify the switch registration function, we reset the refcount to
> zero after initialization and don't increment it when looking up a tree.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian