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authorRussell King <rmk+kernel@armlinux.org.uk>2019-02-11 15:04:24 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-27 10:08:09 +0100
commit418d77caf233c1fa01ec1c9c880b8af855cfd02e (patch)
treed8298520e1fa88fcd1fcd42e1b4b5ea0287bf032
parent81bafd09bb8d98370d8d5d21a1b3bbc48f3dcf28 (diff)
net: phylink: avoid resolving link state too early
commit 87454b6edc1b0143fdb3d9853285477e95af74a4 upstream. During testing on Armada 388 platforms, it was found with a certain module configuration that it was possible to trigger a kernel oops during the module load process, caused by the phylink resolver being triggered for a currently disabled interface. This problem was introduced by changing the way the SFP registration works, which now can result in the sfp link down notification being called during phylink_create(). Fixes: b5bfc21af5cb ("net: sfp: do not probe SFP module before we're attached") Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net> Cc: Sasha Levin <sashal@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/phy/phylink.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 70ce7da26d1f..afe335583832 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -487,6 +487,17 @@ static void phylink_run_resolve(struct phylink *pl)
queue_work(system_power_efficient_wq, &pl->resolve);
}
+static void phylink_run_resolve_and_disable(struct phylink *pl, int bit)
+{
+ unsigned long state = pl->phylink_disable_state;
+
+ set_bit(bit, &pl->phylink_disable_state);
+ if (state == 0) {
+ queue_work(system_power_efficient_wq, &pl->resolve);
+ flush_work(&pl->resolve);
+ }
+}
+
static const struct sfp_upstream_ops sfp_phylink_ops;
static int phylink_register_sfp(struct phylink *pl, struct device_node *np)
@@ -776,9 +787,7 @@ void phylink_stop(struct phylink *pl)
if (pl->sfp_bus)
sfp_upstream_stop(pl->sfp_bus);
- set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
- queue_work(system_power_efficient_wq, &pl->resolve);
- flush_work(&pl->resolve);
+ phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_STOPPED);
}
EXPORT_SYMBOL_GPL(phylink_stop);
@@ -1433,9 +1442,7 @@ static void phylink_sfp_link_down(void *upstream)
WARN_ON(!lockdep_rtnl_is_held());
- set_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
- queue_work(system_power_efficient_wq, &pl->resolve);
- flush_work(&pl->resolve);
+ phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_LINK);
}
static void phylink_sfp_link_up(void *upstream)