linux-kernel - Re: [PATCH 3.16 046/114] batman-adv: Fix broadcast/ogm queue limit on a removed interface

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Message-ID: <20160613192643.GJ3293@otheros>
Date:	Mon, 13 Jun 2016 21:26:43 +0200
From:	Linus Lüssing <linus.luessing@...3.blue>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	akpm@...ux-foundation.org, b.a.t.m.a.n@...ts.open-mesh.org,
	Marek Lindner <mareklindner@...mailbox.ch>,
	Antonio Quartulli <a@...table.cc>,
	Sven Eckelmann <sven@...fation.org>
Subject: Re: [PATCH 3.16 046/114] batman-adv: Fix broadcast/ogm queue limit
 on a removed interface

On Mon, Jun 13, 2016 at 07:36:37PM +0100, Ben Hutchings wrote:
> 3.16.36-rc1 review patch.  If anyone has any objections, please let me know.
> 

Hi Ben,

This one looks weird. The version you added for 3.2.81-rc1 looked
better.

Cheers, Linus



> ------------------
> 
> From: Linus Lüssing <linus.luessing@...3.blue>
> 
> commit c4fdb6cff2aa0ae740c5f19b6f745cbbe786d42f upstream.
> 
> When removing a single interface while a broadcast or ogm packet is
> still pending then we will free the forward packet without releasing the
> queue slots again.
> 
> This patch is supposed to fix this issue.
> 
> Fixes: 6d5808d4ae1b ("batman-adv: Add missing hardif_free_ref in forw_packet_free")
> Signed-off-by: Linus Lüssing <linus.luessing@...3.blue>
> [sven@...fation.org: fix conflicts with current version]
> Signed-off-by: Sven Eckelmann <sven@...fation.org>
> Signed-off-by: Marek Lindner <mareklindner@...mailbox.ch>
> Signed-off-by: Antonio Quartulli <a@...table.cc>
> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> ---
>  net/batman-adv/send.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> --- a/net/batman-adv/send.c
> +++ b/net/batman-adv/send.c
> @@ -638,6 +638,12 @@ batadv_purge_outstanding_packets(struct
>  
>  		if (pending) {
>  			hlist_del(&forw_packet->list);
> +			if (!forw_packet->own)
> +				atomic_inc(&bat_priv->bcast_queue_left);
> +
> +			if (!forw_packet->own)
> +				atomic_inc(&bat_priv->batman_queue_left);
> +
>  			batadv_forw_packet_free(forw_packet);
>  		}
>  	}
>