[PATCH 5.15 63/83] net: phy: Dont WARN for PHY_UP state in mdio_bus_phy_resume()

Greg Kroah-Hartman
2022-10-03T07:32:24Z

From: Lukas Wunner <lukas@wunner.de>

[ Upstream commit ea64cdfad124922c931633e39287c5a31a9b14a1 ]

Commit 744d23c71af3 ("net: phy: Warn about incorrect mdio_bus_phy_resume()
state") introduced a WARN() on resume from system sleep if a PHY is not
in PHY_HALTED state.

Commit 6dbe852c379f ("net: phy: Don't WARN for PHY_READY state in
mdio_bus_phy_resume()") added an exemption for PHY_READY state from
the WARN().

It turns out PHY_UP state needs to be exempted as well because the
following may happen on suspend:

mdio_bus_phy_suspend()
phy_stop_machine()
phydev->state = PHY_UP # if (phydev->state >= PHY_UP)

Fixes: 744d23c71af3 ("net: phy: Warn about incorrect mdio_bus_phy_resume() state")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/netdev/2b1a1588-505e-dff3-301d-bfc1fb14d685@samsung.com/
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Cc: Xiaolei Wang <xiaolei.wang@windriver.com>
Link: https://lore.kernel.org/r/8128fdb51eeebc9efbf3776a4097363a1317aaf1.1663905575.git.lukas@wunner.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/phy/phy_device.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index b616f55ea222..c5b92ffaffb9 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -315,11 +315,13 @@ static __maybe_unused int mdio_bus_phy_resume(struct device *dev)

phydev->suspended_by_mdio_bus = 0;

- /* If we manged to get here with the PHY state machine in a state neither
- * PHY_HALTED nor PHY_READY this is an indication that something went wrong
- * and we should most likely be using MAC managed PM and we are not.
+ /* If we managed to get here with the PHY state machine in a state
+ * neither PHY_HALTED, PHY_READY nor PHY_UP, this is an indication
+ * that something went wrong and we should most likely be using
+ * MAC managed PM, but we are not.
*/
- WARN_ON(phydev->state != PHY_HALTED && phydev->state != PHY_READY);
+ WARN_ON(phydev->state != PHY_HALTED && phydev->state != PHY_READY &&
+ phydev->state != PHY_UP);

ret = phy_init_hw(phydev);
if (ret < 0)
--
2.35.1