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| author | Russell King <rmk+kernel@armlinux.org.uk> | 2019-02-11 15:04:24 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-27 10:09:03 +0100 |
| commit | 101e1972655200fccb5b9017c98bed49924845ac (patch) | |
| tree | 1a3e32b094790e71ff85ee24503e0ae1d9f545c8 | |
| parent | c80bf03569af40faf5ad2c1184e72f48aa0048b6 (diff) | |
| download | linux-rpi-101e1972655200fccb5b9017c98bed49924845ac.tar.gz linux-rpi-101e1972655200fccb5b9017c98bed49924845ac.tar.bz2 linux-rpi-101e1972655200fccb5b9017c98bed49924845ac.zip | |
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.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index 70f3f90c2ed6..2787e8b1d668 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -502,6 +502,17 @@ 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); @@ -955,9 +966,7 @@ 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); @@ -1664,9 +1673,7 @@ 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) |