39a7c8d809
Use 'make target/linux/refresh' to refresh backport patches. Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
78 lines
2.4 KiB
Diff
78 lines
2.4 KiB
Diff
From c146f9bc195a9dc3ad7fd000a14540e7c9df952d Mon Sep 17 00:00:00 2001
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From: Vladimir Oltean <vladimir.oltean@nxp.com>
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Date: Thu, 6 Jan 2022 01:11:15 +0200
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Subject: [PATCH 4/6] net: dsa: hold rtnl_mutex when calling
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dsa_master_{setup,teardown}
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DSA needs to simulate master tracking events when a binding is first
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with a DSA master established and torn down, in order to give drivers
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the simplifying guarantee that ->master_state_change calls are made
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only when the master's readiness state to pass traffic changes.
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master_state_change() provide a operational bool that DSA driver can use
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to understand if DSA master is operational or not.
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To avoid races, we need to block the reception of
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NETDEV_UP/NETDEV_CHANGE/NETDEV_GOING_DOWN events in the netdev notifier
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chain while we are changing the master's dev->dsa_ptr (this changes what
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netdev_uses_dsa(dev) reports).
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The dsa_master_setup() and dsa_master_teardown() functions optionally
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require the rtnl_mutex to be held, if the tagger needs the master to be
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promiscuous, these functions call dev_set_promiscuity(). Move the
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rtnl_lock() from that function and make it top-level.
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Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/dsa/dsa2.c | 8 ++++++++
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net/dsa/master.c | 4 ++--
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2 files changed, 10 insertions(+), 2 deletions(-)
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--- a/net/dsa/dsa2.c
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+++ b/net/dsa/dsa2.c
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@@ -1034,6 +1034,8 @@ static int dsa_tree_setup_master(struct
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struct dsa_port *dp;
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int err;
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+ rtnl_lock();
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+
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list_for_each_entry(dp, &dst->ports, list) {
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if (dsa_port_is_cpu(dp)) {
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err = dsa_master_setup(dp->master, dp);
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@@ -1042,6 +1044,8 @@ static int dsa_tree_setup_master(struct
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}
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}
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+ rtnl_unlock();
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+
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return 0;
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}
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@@ -1049,9 +1053,13 @@ static void dsa_tree_teardown_master(str
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{
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struct dsa_port *dp;
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+ rtnl_lock();
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+
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list_for_each_entry(dp, &dst->ports, list)
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if (dsa_port_is_cpu(dp))
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dsa_master_teardown(dp->master);
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+
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+ rtnl_unlock();
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}
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static int dsa_tree_setup_lags(struct dsa_switch_tree *dst)
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--- a/net/dsa/master.c
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+++ b/net/dsa/master.c
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@@ -267,9 +267,9 @@ static void dsa_master_set_promiscuity(s
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if (!ops->promisc_on_master)
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return;
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- rtnl_lock();
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+ ASSERT_RTNL();
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+
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dev_set_promiscuity(dev, inc);
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- rtnl_unlock();
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}
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static ssize_t tagging_show(struct device *d, struct device_attribute *attr,
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