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Patch in this message | | | From | "Levin, Alexander (Sasha Levin)" <> | Subject | [PATCH for v4.9 LTS 69/87] phy state machine: failsafe leave invalid RUNNING state | Date | Sat, 15 Jul 2017 01:26:21 +0000 |
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From: Zefir Kurtisi <zefir.kurtisi@neratec.com>
[ Upstream commit 811a919135b980bac8009d042acdccf10dc1ef5e ]
While in RUNNING state, phy_state_machine() checks for link changes by comparing phydev->link before and after calling phy_read_status(). This works as long as it is guaranteed that phydev->link is never changed outside the phy_state_machine().
If in some setups this happens, it causes the state machine to miss a link loss and remain RUNNING despite phydev->link being 0.
This has been observed running a dsa setup with a process continuously polling the link states over ethtool each second (SNMPD RFC-1213 agent). Disconnecting the link on a phy followed by a ETHTOOL_GSET causes dsa_slave_get_settings() / dsa_slave_get_link_ksettings() to call phy_read_status() and with that modify the link status - and with that bricking the phy state machine.
This patch adds a fail-safe check while in RUNNING, which causes to move to CHANGELINK when the link is gone and we are still RUNNING.
Signed-off-by: Zefir Kurtisi <zefir.kurtisi@neratec.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> --- drivers/net/phy/phy.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index edd30ebbf275..6e12401b5102 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -1060,6 +1060,15 @@ void phy_state_machine(struct work_struct *work) if (old_link != phydev->link) phydev->state = PHY_CHANGELINK; } + /* + * Failsafe: check that nobody set phydev->link=0 between two + * poll cycles, otherwise we won't leave RUNNING state as long + * as link remains down. + */ + if (!phydev->link && phydev->state == PHY_RUNNING) { + phydev->state = PHY_CHANGELINK; + phydev_err(phydev, "no link in PHY_RUNNING\n"); + } break; case PHY_CHANGELINK: err = phy_read_status(phydev); -- 2.11.0
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