net: fec: clear receive interrupts before processing a packet

[ Upstream commit ed63f1dcd5788d36f942fbcce350742385e3e18c ]

The patch just to re-submit the patch "db3421c114cfa6326" because the
patch "4d494cdc92b3b9a0" remove the change.

Clear any pending receive interrupt before we process a pending packet.
This helps to avoid any spurious interrupts being raised after we have
fully cleaned the receive ring, while still allowing an interrupt to be
raised if we receive another packet.

The position of this is critical: we must do this prior to reading the
next packet status to avoid potentially dropping an interrupt when a
packet is still pending.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index b349e6f36ea75fa6a471d3c2a37a7bee21d8e59c..de63266de16b9a3b22d32b01253e24fc7200734a 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1402,6 +1402,7 @@ fec_enet_rx_queue(struct net_device *ndev, int budget, u16 queue_id)
                if ((status & BD_ENET_RX_LAST) == 0)
                        netdev_err(ndev, "rcv is not +last\n");
 
+               writel(FEC_ENET_RXF, fep->hwp + FEC_IEVENT);
 
                /* Check for errors. */
                if (status & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_NO |