linux-kernel - [PATCH] xen-netback: Small fixes around internal queue purging

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Date:	Wed, 6 Aug 2014 19:16:12 +0100
From:	Zoltan Kiss <zoltan.kiss@...rix.com>
To:	Wei Liu <wei.liu2@...rix.com>,
	Ian Campbell <Ian.Campbell@...rix.com>
CC:	Zoltan Kiss <zoltan.kiss@...rix.com>,
	David Vrabel <david.vrabel@...rix.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<xen-devel@...ts.xenproject.org>
Subject: [PATCH] xen-netback: Small fixes around internal queue purging

This patch adds an extra internal queue purging for xenvif_carrier_off. It makes
sense to do this when the carrier is switched off.
Also, it uses the proper helper instead of a while loop to the purging at
another place.

Signed-off-by: Zoltan Kiss <zoltan.kiss@...rix.com>
Signed-off-by: David Vrabel <david.vrabel@...rix.com>
Cc: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: xen-devel@...ts.xenproject.org 
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index cbe6b51..df9507e 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -533,6 +533,9 @@ void xenvif_carrier_off(struct xenvif *vif)
 	}
 
 	rtnl_unlock();
+
+	skb_queue_purge(&vif->rx_queue);
+	vif->rx_last_skb_slots = 0;
 }
 
 void xenvif_disconnect(struct xenvif *vif)
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index e462cf2c..f728f73 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1932,7 +1932,6 @@ static void xenvif_start_queue(struct xenvif *vif)
 int xenvif_kthread_guest_rx(void *data)
 {
 	struct xenvif *vif = data;
-	struct sk_buff *skb;
 
 	while (!kthread_should_stop()) {
 		wait_event_interruptible(vif->wq,
@@ -2009,8 +2008,7 @@ int xenvif_kthread_guest_rx(void *data)
 	}
 
 	/* Bin any remaining skbs */
-	while ((skb = skb_dequeue(&vif->rx_queue)) != NULL)
-		dev_kfree_skb(skb);
+	skb_queue_purge(&vif->rx_queue);
 
 	return 0;
 }
--
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