net: fec: clear receive interrupts before processing a packet

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>

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 4d5c1ba6b64c6489b2ee2305eff4deebd42bdb2f..91925e38705eb2c8c6c03ea41587d9801a416479 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1407,6 +1407,7 @@ 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 |