[PATCH 4.9 039/130] cxgb4: when disabling dcb set txq dcb priority to 0

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ganesh Goudar <ganes...@chelsio.com>

[ Upstream commit 5ce36338a30f9814fc4824f9fe6c20cd83d872c7 ]

When we are disabling DCB, store "0" in txq->dcb_prio
since that's used for future TX Work Request "OVLAN_IDX"
values. Setting non zero priority upon disabling DCB
would halt the traffic.

Reported-by: AMG Zollner Robert <rob...@cloudmedia.eu>
CC: David Ahern <d...@cumulusnetworks.com>
Signed-off-by: Casey Leedom <lee...@chelsio.com>
Signed-off-by: Ganesh Goudar <ganes...@chelsio.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -274,7 +274,7 @@ static void dcb_tx_queue_prio_enable(str
                                "Can't %s DCB Priority on port %d, TX Queue %d: 
err=%d\n",
                                enable ? "set" : "unset", pi->port_id, i, -err);
                else
-                       txq->dcb_prio = value;
+                       txq->dcb_prio = enable ? value : 0;
        }
 }