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authorAnnie Li <Annie.li@oracle.com>2012-06-27 00:46:58 +0000
committerDavid S. Miller <davem@davemloft.net>2012-06-29 00:50:20 -0700
commit1e0b6eac6a150a35b45d019681b0021896354ae5 (patch)
tree97b778fcefabf41c3cefce8eea3b476d26ee7ad4 /drivers/net/xen-netback
parent7fa8ad6df71f4778b23e17b0106aaef02b518684 (diff)
xen/netback: only non-freed SKB is queued into tx_queue
After SKB is queued into tx_queue, it will be freed if request_gop is NULL. However, no dequeue action is called in this situation, it is likely that tx_queue constains freed SKB. This patch should fix this issue, and it is based on 3.5.0-rc4+. This issue is found through code inspection, no bug is seen with it currently. I run netperf test for several hours, and no network regression was found. Signed-off-by: Annie Li <annie.li@oracle.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/xen-netback')
-rw-r--r--drivers/net/xen-netback/netback.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index f4a6fcaeffb..682633bfe00 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1363,8 +1363,6 @@ static unsigned xen_netbk_tx_build_gops(struct xen_netbk *netbk)
INVALID_PENDING_IDX);
}
- __skb_queue_tail(&netbk->tx_queue, skb);
-
netbk->pending_cons++;
request_gop = xen_netbk_get_requests(netbk, vif,
@@ -1376,6 +1374,8 @@ static unsigned xen_netbk_tx_build_gops(struct xen_netbk *netbk)
}
gop = request_gop;
+ __skb_queue_tail(&netbk->tx_queue, skb);
+
vif->tx.req_cons = idx;
xen_netbk_check_rx_xenvif(vif);