Patch "net: fec: clear receive interrupts before processing a packet" has been added to the 4.2-stable tree

Patch "net: fec: clear receive interrupts before processing a packet" has been added to the 4.2-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    net: fec: clear receive interrupts before processing a packet

to the 4.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-fec-clear-receive-interrupts-before-processing-a-packet.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Sep 30 05:25:07 CEST 2015
From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Wed, 2 Sep 2015 17:24:14 +0800
Subject: net: fec: clear receive interrupts before processing a packet

From: Russell King <rmk+kernel@arm.linux.org.uk>

[ 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>
---
 drivers/net/ethernet/freescale/fec_main.c |    1 +
 1 file changed, 1 insertion(+)

--- 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 *nde
 		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 |


Patches currently in stable-queue which might be from rmk+kernel@arm.linux.org.uk are

queue-4.2/net-fec-clear-receive-interrupts-before-processing-a-packet.patch
queue-4.2/net-dsa-actually-force-the-speed-on-the-cpu-port.patch