[PATCH 3.16 296/305] net: macb: Fix race condition in driver when Rx frame is dropped

[Ben Hutchings]

3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@xxxxxxxxxx>

commit d4c216c54197d741ed8b7ca54f13645dfb3eacde upstream.

Under heavy Rx load, observed that the Hw is updating the USED bit
and it is not updating the received frame status to the BD control
field. This could be lack of resources for processing the BDs at high
data rates. Driver drops the frame associated with this BD but not
clearing the USED bit. So, this is causing hang condition as Hw
expects USED bit to be cleared for this BD.

Signed-off-by: Punnaiah Choudary Kalluri <punnaia@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/cadence/macb.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -634,6 +634,9 @@ static void gem_rx_refill(struct macb *b
 
 			/* properly align Ethernet header */
 			skb_reserve(skb, NET_IP_ALIGN);
+		} else {
+			bp->rx_ring[entry].addr &= ~MACB_BIT(RX_USED);
+			bp->rx_ring[entry].ctrl = 0;
 		}
 	}