From d4c216c54197d741ed8b7ca54f13645dfb3eacde Mon Sep 17 00:00:00 2001
From: Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@xilinx.com>
Date: Wed, 29 Apr 2015 08:34:46 +0530
Subject: [PATCH] net: macb: Fix race condition in driver when Rx frame is
dropped
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@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/cadence/macb.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index 665c29098e3c2..4104d49f005d4 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -707,6 +707,9 @@ static void gem_rx_refill(struct macb *bp)
/* 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;
}
}
--
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