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authorTaehee Yoo <ap420073@gmail.com>2020-02-28 21:01:56 +0300
committerDavid S. Miller <davem@davemloft.net>2020-03-01 08:37:03 +0300
commit81390d0c4e56ac7752c97d7e8209357673d1a8ab (patch)
treebaae0ea0a9de2b2d67f72a7c2da94f0fcd02eeca /net/hsr/hsr_device.c
parent4b793acdca0050739b99ace6a8b9e7f717f57c6b (diff)
downloadlinux-81390d0c4e56ac7752c97d7e8209357673d1a8ab.tar.xz
hsr: remove unnecessary rcu_read_lock() in hsr module
In order to access the port list, the hsr_port_get_hsr() is used. And this is protected by RTNL and RCU. The hsr_fill_info(), hsr_check_carrier(), hsr_dev_open() and hsr_get_max_mtu() are protected by RTNL. So, rcu_read_lock() in these functions are not necessary. The hsr_handle_frame() also uses rcu_read_lock() but this function is called by packet path. It's already protected by RCU. So, the rcu_read_lock() in hsr_handle_frame() can be removed. Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/hsr/hsr_device.c')
-rw-r--r--net/hsr/hsr_device.c23
1 files changed, 7 insertions, 16 deletions
diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
index a48f621c2fec..00532d14fc7c 100644
--- a/net/hsr/hsr_device.c
+++ b/net/hsr/hsr_device.c
@@ -57,24 +57,19 @@ static void hsr_set_operstate(struct hsr_port *master, bool has_carrier)
static bool hsr_check_carrier(struct hsr_port *master)
{
struct hsr_port *port;
- bool has_carrier;
- has_carrier = false;
+ ASSERT_RTNL();
- rcu_read_lock();
- hsr_for_each_port(master->hsr, port)
+ hsr_for_each_port(master->hsr, port) {
if (port->type != HSR_PT_MASTER && is_slave_up(port->dev)) {
- has_carrier = true;
- break;
+ netif_carrier_on(master->dev);
+ return true;
}
- rcu_read_unlock();
+ }
- if (has_carrier)
- netif_carrier_on(master->dev);
- else
- netif_carrier_off(master->dev);
+ netif_carrier_off(master->dev);
- return has_carrier;
+ return false;
}
static void hsr_check_announce(struct net_device *hsr_dev,
@@ -118,11 +113,9 @@ int hsr_get_max_mtu(struct hsr_priv *hsr)
struct hsr_port *port;
mtu_max = ETH_DATA_LEN;
- rcu_read_lock();
hsr_for_each_port(hsr, port)
if (port->type != HSR_PT_MASTER)
mtu_max = min(port->dev->mtu, mtu_max);
- rcu_read_unlock();
if (mtu_max < HSR_HLEN)
return 0;
@@ -157,7 +150,6 @@ static int hsr_dev_open(struct net_device *dev)
hsr = netdev_priv(dev);
designation = '\0';
- rcu_read_lock();
hsr_for_each_port(hsr, port) {
if (port->type == HSR_PT_MASTER)
continue;
@@ -175,7 +167,6 @@ static int hsr_dev_open(struct net_device *dev)
netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a fully working HSR network\n",
designation, port->dev->name);
}
- rcu_read_unlock();
if (designation == '\0')
netdev_warn(dev, "No slave devices configured\n");