Commit 418d77ca authored by Russell King's avatar Russell King Committed by Greg Kroah-Hartman

net: phylink: avoid resolving link state too early

commit 87454b6e 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: b5bfc21a ("net: sfp: do not probe SFP module before we're attached")
Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 81bafd09
...@@ -487,6 +487,17 @@ static void phylink_run_resolve(struct phylink *pl) ...@@ -487,6 +487,17 @@ static void phylink_run_resolve(struct phylink *pl)
queue_work(system_power_efficient_wq, &pl->resolve); 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 const struct sfp_upstream_ops sfp_phylink_ops;
static int phylink_register_sfp(struct phylink *pl, struct device_node *np) static int phylink_register_sfp(struct phylink *pl, struct device_node *np)
...@@ -776,9 +787,7 @@ void phylink_stop(struct phylink *pl) ...@@ -776,9 +787,7 @@ void phylink_stop(struct phylink *pl)
if (pl->sfp_bus) if (pl->sfp_bus)
sfp_upstream_stop(pl->sfp_bus); sfp_upstream_stop(pl->sfp_bus);
set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state); phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_STOPPED);
queue_work(system_power_efficient_wq, &pl->resolve);
flush_work(&pl->resolve);
} }
EXPORT_SYMBOL_GPL(phylink_stop); EXPORT_SYMBOL_GPL(phylink_stop);
...@@ -1433,9 +1442,7 @@ static void phylink_sfp_link_down(void *upstream) ...@@ -1433,9 +1442,7 @@ static void phylink_sfp_link_down(void *upstream)
WARN_ON(!lockdep_rtnl_is_held()); WARN_ON(!lockdep_rtnl_is_held());
set_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state); phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_LINK);
queue_work(system_power_efficient_wq, &pl->resolve);
flush_work(&pl->resolve);
} }
static void phylink_sfp_link_up(void *upstream) static void phylink_sfp_link_up(void *upstream)
......
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