net: phylink: avoid resolving link state too early

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: bb0d855501f2 ("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>

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index e7becc7379d74899c5d007bc0e7789aeb953fc6e..938803237d7fa54ed70e7118bfe4d5b2dfbf0c47 100644 (file)
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -474,6 +474,17 @@ 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 void phylink_fixed_poll(struct timer_list *t)
 {
        struct phylink *pl = container_of(t, struct phylink, link_poll);
@@ -924,9 +935,7 @@ void phylink_stop(struct phylink *pl)
        if (pl->link_an_mode == MLO_AN_FIXED && !IS_ERR(pl->link_gpio))
                del_timer_sync(&pl->link_poll);
 
-       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);
 
@@ -1632,9 +1641,7 @@ static void phylink_sfp_link_down(void *upstream)
 
        ASSERT_RTNL();
 
-       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)