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hsr: remove hsr interface if all slaves are removed

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When all hsr slave interfaces are removed, hsr interface doesn't work.
At that moment, it's fine to remove an unused hsr interface automatically
for saving resources.
That's a common behavior of virtual interfaces.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Taehee Yoo 2020-04-30 17:37:02 +00:00 committed by David S. Miller
parent 1b2e788490
commit 34a9c361dd
1 changed files with 20 additions and 2 deletions
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22
net/hsr/hsr_main.c
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@ -15,12 +15,23 @@
#include "hsr_framereg.h"
#include "hsr_slave.h"
static bool hsr_slave_empty(struct hsr_priv *hsr)
{
struct hsr_port *port;
hsr_for_each_port(hsr, port)
if (port->type != HSR_PT_MASTER)
return false;
return true;
}
static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
void *ptr)
{
struct net_device *dev;
struct hsr_port *port, *master;
struct net_device *dev;
struct hsr_priv *hsr;
LIST_HEAD(list_kill);
int mtu_max;
int res;
@ -85,8 +96,15 @@ static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
master->dev->mtu = mtu_max;
break;
case NETDEV_UNREGISTER:
if (!is_hsr_master(dev))
if (!is_hsr_master(dev)) {
master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
hsr_del_port(port);
if (hsr_slave_empty(master->hsr)) {
unregister_netdevice_queue(master->dev,
&list_kill);
unregister_netdevice_many(&list_kill);
}
}
break;
case NETDEV_PRE_TYPE_CHANGE:
/* HSR works only on Ethernet devices. Refuse slave to change