From: Andre Werner andre.werner@systec-electronic.com

[ Upstream commit 61c81872815f46006982bb80460c0c80a949b35b ]

If phydev->irq is set unconditionally, check for valid interrupt handler or fall back to polling mode to prevent nullptr exceptions in interrupt service routine.

Signed-off-by: Andre Werner andre.werner@systec-electronic.com Reviewed-by: Andrew Lunn andrew@lunn.ch Link: https://lore.kernel.org/r/20240129135734.18975-2-andre.werner@systec-electro... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Xiangyu Chen xiangyu.chen@windriver.com --- drivers/net/phy/phy_device.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index f25b0d338ca8..b165f92db51c 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -1378,6 +1378,11 @@ int phy_sfp_probe(struct phy_device *phydev, } EXPORT_SYMBOL(phy_sfp_probe);

+static bool phy_drv_supports_irq(struct phy_driver *phydrv) +{ + return phydrv->config_intr && phydrv->handle_interrupt; +} + /** * phy_attach_direct - attach a network device to a given PHY device pointer * @dev: network device to attach @@ -1487,6 +1492,9 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,

phydev->interrupts = PHY_INTERRUPT_DISABLED;

+ if (!phy_drv_supports_irq(phydev->drv) && phy_interrupt_is_valid(phydev)) + phydev->irq = PHY_POLL; + /* Port is set to PORT_TP by default and the actual PHY driver will set * it to different value depending on the PHY configuration. If we have * the generic PHY driver we can't figure it out, thus set the old @@ -2926,11 +2934,6 @@ s32 phy_get_internal_delay(struct phy_device *phydev, struct device *dev, } EXPORT_SYMBOL(phy_get_internal_delay);

-static bool phy_drv_supports_irq(struct phy_driver *phydrv) -{ - return phydrv->config_intr && phydrv->handle_interrupt; -} - /** * fwnode_mdio_find_device - Given a fwnode, find the mdio_device * @fwnode: pointer to the mdio_device's fwnode