diff options
| author | Russell King <rmk+kernel@armlinux.org.uk> | 2019-02-11 15:04:24 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-02-12 12:25:18 -0500 |
| commit | 87454b6edc1b0143fdb3d9853285477e95af74a4 (patch) | |
| tree | b1825d783af262f1601dc91f7ead403884a058df /drivers/net/phy/phylink.c | |
| parent | a7603ac1fc8ce1409f8ff70e6ce505f308b2c002 (diff) | |
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: 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>
Diffstat (limited to 'drivers/net/phy/phylink.c')
| -rw-r--r-- | drivers/net/phy/phylink.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index e7becc7379d7..938803237d7f 100644 --- 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) |