netdev - RE: [PATCH v2 1/2] xen-netback: fix memory leaks on XenBus disconnect

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Date:   Wed, 18 Jan 2017 09:27:06 +0000
From:   Paul Durrant <Paul.Durrant@...rix.com>
To:     Igor Druzhinin <igor.druzhinin@...rix.com>,
        Wei Liu <wei.liu2@...rix.com>
CC:     "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Igor Druzhinin <igor.druzhinin@...rix.com>
Subject: RE: [PATCH v2 1/2] xen-netback: fix memory leaks on XenBus disconnect

> -----Original Message-----
> From: Igor Druzhinin [mailto:igor.druzhinin@...rix.com]
> Sent: 17 January 2017 20:50
> To: Wei Liu <wei.liu2@...rix.com>
> Cc: Paul Durrant <Paul.Durrant@...rix.com>; xen-devel@...ts.xenproject.org;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Igor Druzhinin
> <igor.druzhinin@...rix.com>
> Subject: [PATCH v2 1/2] xen-netback: fix memory leaks on XenBus
> disconnect
> 
> Eliminate memory leaks introduced several years ago by cleaning the
> queue resources which are allocated on XenBus connection event. Namely,
> queue
> structure array and pages used for IO rings.
> 
> Signed-off-by: Igor Druzhinin <igor.druzhinin@...rix.com>

Reviewed-by: Paul Durrant <paul.durrant@...rix.com>

> ---
>  drivers/net/xen-netback/xenbus.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-
> netback/xenbus.c
> index 6c57b02..3e99071 100644
> --- a/drivers/net/xen-netback/xenbus.c
> +++ b/drivers/net/xen-netback/xenbus.c
> @@ -493,11 +493,20 @@ static int backend_create_xenvif(struct
> backend_info *be)
>  static void backend_disconnect(struct backend_info *be)
>  {
>  	if (be->vif) {
> +		unsigned int queue_index;
> +
>  		xen_unregister_watchers(be->vif);
>  #ifdef CONFIG_DEBUG_FS
>  		xenvif_debugfs_delif(be->vif);
>  #endif /* CONFIG_DEBUG_FS */
>  		xenvif_disconnect_data(be->vif);
> +		for (queue_index = 0; queue_index < be->vif-
> >num_queues; ++queue_index)
> +			xenvif_deinit_queue(&be->vif-
> >queues[queue_index]);
> +
> +		vfree(be->vif->queues);
> +		be->vif->num_queues = 0;
> +		be->vif->queues = NULL;
> +
>  		xenvif_disconnect_ctrl(be->vif);
>  	}
>  }
> @@ -1026,6 +1035,8 @@ static void connect(struct backend_info *be)
>  err:
>  	if (be->vif->num_queues > 0)
>  		xenvif_disconnect_data(be->vif); /* Clean up existing
> queues */
> +	for (queue_index = 0; queue_index < be->vif->num_queues;
> ++queue_index)
> +		xenvif_deinit_queue(&be->vif->queues[queue_index]);
>  	vfree(be->vif->queues);
>  	be->vif->queues = NULL;
>  	be->vif->num_queues = 0;
> --
> 1.8.3.1