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net: fec: clear receive interrupts before processing a packet 

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>
This commit is contained in:
Russell King 2014-07-08 13:01:49 +01:00 committed by David S. Miller
parent 36cdc743a3
commit db3421c114
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/freescale/fec_main.c
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@ -1184,6 +1184,8 @@ fec_enet_rx(struct net_device *ndev, int budget)
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 |
BD_ENET_RX_CR | BD_ENET_RX_OV)) {