linux-kernel - [PATCH 4.4 037/101] net: mvneta: Fix for_each_present

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Date:   Mon,  3 Jul 2017 15:34:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stefan Roese <stefan.roese@...il.com>,
        Jisheng Zhang <jszhang@...vell.com>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Gregory CLEMENT <gregory.clement@...e-electrons.com>,
        "David S. Miller" <davem@...emloft.net>,
        Amit Pundir <amit.pundir@...aro.org>
Subject: [PATCH 4.4 037/101] net: mvneta: Fix for_each_present_cpu usage

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gregory CLEMENT <gregory.clement@...e-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@...il.com>
Suggested-by: Jisheng Zhang <jszhang@...vell.com>
Suggested-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);