This is a note to let you know that I've just added the patch titled
net: mvneta: Fix for_each_present_cpu usage
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:
net-mvneta-fix-for_each_present_cpu-usage.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@xxxxxxxxxxxxxxx> know about it.
>From 129219e4950a3fcf9323b3bbd8b224c7aa873985 Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
Date: Thu, 4 Feb 2016 22:09:23 +0100
Subject: net: mvneta: Fix for_each_present_cpu usage
From: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
commit 129219e4950a3fcf9323b3bbd8b224c7aa873985 upstream.
This patch convert the for_each_present in on_each_cpu, instead of
applying on the present cpus it will be applied only on the online cpus.
This fix a bug reported on
http://thread.gmane.org/gmane.linux.ports.arm.kernel/468173.
Using the macro on_each_cpu (instead of a for_each_* loop) also ensures
that all the calls will be done all at once.
Fixes: f86428854480 ("net: mvneta: Statically assign queues to CPUs")
Reported-by: Stefan Roese <stefan.roese@xxxxxxxxx>
Suggested-by: Jisheng Zhang <jszhang@xxxxxxxxxxx>
Suggested-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/marvell/mvneta.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -2446,7 +2446,7 @@ static void mvneta_start_dev(struct mvne
mvneta_port_enable(pp);
/* Enable polling on the port */
- for_each_present_cpu(cpu) {
+ for_each_online_cpu(cpu) {
struct mvneta_pcpu_port *port = per_cpu_ptr(pp->ports, cpu);
napi_enable(&port->napi);
@@ -2472,7 +2472,7 @@ static void mvneta_stop_dev(struct mvnet
phy_stop(pp->phy_dev);
- for_each_present_cpu(cpu) {
+ for_each_online_cpu(cpu) {
struct mvneta_pcpu_port *port = per_cpu_ptr(pp->ports, cpu);
napi_disable(&port->napi);
@@ -2902,13 +2902,11 @@ err_cleanup_rxqs:
static int mvneta_stop(struct net_device *dev)
{
struct mvneta_port *pp = netdev_priv(dev);
- int cpu;
mvneta_stop_dev(pp);
mvneta_mdio_remove(pp);
unregister_cpu_notifier(&pp->cpu_notifier);
- for_each_present_cpu(cpu)
- smp_call_function_single(cpu, mvneta_percpu_disable, pp, true);
+ on_each_cpu(mvneta_percpu_disable, pp, true);
free_percpu_irq(dev->irq, pp->ports);
mvneta_cleanup_rxqs(pp);
mvneta_cleanup_txqs(pp);
Patches currently in stable-queue which might be from gregory.clement@xxxxxxxxxxxxxxxxxx are
queue-4.4/net-mvneta-fix-for_each_present_cpu-usage.patch