[PATCH 4.4 037/101] net: mvneta: Fix for_each_present_cpu usage

Greg Kroah-Hartman
2017-07-03T15:06:32Z

From: Gregory CLEMENT <gregory.clement@free-electrons.com>

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@gmail.com>
Suggested-by: Jisheng Zhang <jszhang@marvell.com>
Suggested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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);