Patch "[PATCH 016/135] e1000e: fix division by zero on jumbo MTUs" has been added to the 4.4-stable tree

Patch "[PATCH 016/135] e1000e: fix division by zero on jumbo MTUs" has been added to the 4.4-stable tree

[gregkh]

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

    [PATCH 016/135] e1000e: fix division by zero on jumbo MTUs

to the 4.4-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:
     0016-e1000e-fix-division-by-zero-on-jumbo-MTUs.patch
and it can be found in the queue-4.4 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 6f962b9a4211413d3159bb652edba114e5b8758b Mon Sep 17 00:00:00 2001
From: Dmitry Fleytman <dmitry@daynix.com>
Date: Tue, 13 Oct 2015 12:48:18 +0300
Subject: [PATCH 016/135] e1000e: fix division by zero on jumbo MTUs

[ Upstream commit b77ac46bbae862dcb3f51296825c940404c69b0f ]

This patch fixes possible division by zero in receive
interrupt handler when working without adaptive interrupt
moderation.

The adaptive interrupt moderation mechanism is typically
disabled on jumbo MTUs.

Signed-off-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Leonid Bloch <leonid@daynix.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/intel/e1000e/netdev.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -1959,8 +1959,10 @@ static irqreturn_t e1000_intr_msix_rx(in
 	 * previous interrupt.
 	 */
 	if (rx_ring->set_itr) {
-		writel(1000000000 / (rx_ring->itr_val * 256),
-		       rx_ring->itr_register);
+		u32 itr = rx_ring->itr_val ?
+			  1000000000 / (rx_ring->itr_val * 256) : 0;
+
+		writel(itr, rx_ring->itr_register);
 		rx_ring->set_itr = 0;
 	}
 


Patches currently in stable-queue which might be from dmitry@daynix.com are

queue-4.4/0016-e1000e-fix-division-by-zero-on-jumbo-MTUs.patch