From 66bdede495c71da9c5ce18542976fae53642880b Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Wed, 18 Oct 2017 13:54:03 +0200 Subject: [PATCH] of_mdio: Fix broken PHY IRQ in case of probe deferral If an Ethernet PHY is initialized before the interrupt controller it is connected to, a message like the following is printed: irq: no irq domain found for /interrupt-controller@e61c0000 ! However, the actual error is ignored, leading to a non-functional (POLL) PHY interrupt later: Micrel KSZ8041RNLI ee700000.ethernet-ffffffff:01: attached PHY driver [Micrel KSZ8041RNLI] (mii_bus:phy_addr=ee700000.ethernet-ffffffff:01, irq=POLL) Depending on whether the PHY driver will fall back to polling, Ethernet may or may not work. To fix this: 1. Switch of_mdiobus_register_phy() from irq_of_parse_and_map() to of_irq_get(). Unlike the former, the latter returns -EPROBE_DEFER if the interrupt controller is not yet available, so this condition can be detected. Other errors are handled the same as before, i.e. use the passed mdio->irq[addr] as interrupt. 2. Propagate and handle errors from of_mdiobus_register_phy() and of_mdiobus_register_device(). Signed-off-by: Geert Uytterhoeven Signed-off-by: David S. Miller --- drivers/of/of_mdio.c | 39 +++++++++++++++++++++++++++------------ 1 file changed, 27 insertions(+), 12 deletions(-) diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c index d94dd8b..9825858 100644 --- a/drivers/of/of_mdio.c +++ b/drivers/of/of_mdio.c @@ -44,7 +44,7 @@ static int of_get_phy_id(struct device_node *device, u32 *phy_id) return -EINVAL; } -static void of_mdiobus_register_phy(struct mii_bus *mdio, +static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *child, u32 addr) { struct phy_device *phy; @@ -60,9 +60,13 @@ static void of_mdiobus_register_phy(struct mii_bus *mdio, else phy = get_phy_device(mdio, addr, is_c45); if (IS_ERR(phy)) - return; + return PTR_ERR(phy); - rc = irq_of_parse_and_map(child, 0); + rc = of_irq_get(child, 0); + if (rc == -EPROBE_DEFER) { + phy_device_free(phy); + return rc; + } if (rc > 0) { phy->irq = rc; mdio->irq[addr] = rc; @@ -84,22 +88,23 @@ static void of_mdiobus_register_phy(struct mii_bus *mdio, if (rc) { phy_device_free(phy); of_node_put(child); - return; + return rc; } dev_dbg(&mdio->dev, "registered phy %s at address %i\n", child->name, addr); + return 0; } -static void of_mdiobus_register_device(struct mii_bus *mdio, - struct device_node *child, u32 addr) +static int of_mdiobus_register_device(struct mii_bus *mdio, + struct device_node *child, u32 addr) { struct mdio_device *mdiodev; int rc; mdiodev = mdio_device_create(mdio, addr); if (IS_ERR(mdiodev)) - return; + return PTR_ERR(mdiodev); /* Associate the OF node with the device structure so it * can be looked up later. @@ -112,11 +117,12 @@ static void of_mdiobus_register_device(struct mii_bus *mdio, if (rc) { mdio_device_free(mdiodev); of_node_put(child); - return; + return rc; } dev_dbg(&mdio->dev, "registered mdio device %s at address %i\n", child->name, addr); + return 0; } /* The following is a list of PHY compatible strings which appear in @@ -219,9 +225,11 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np) } if (of_mdiobus_child_is_phy(child)) - of_mdiobus_register_phy(mdio, child, addr); + rc = of_mdiobus_register_phy(mdio, child, addr); else - of_mdiobus_register_device(mdio, child, addr); + rc = of_mdiobus_register_device(mdio, child, addr); + if (rc) + goto unregister; } if (!scanphys) @@ -242,12 +250,19 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np) dev_info(&mdio->dev, "scan phy %s at address %i\n", child->name, addr); - if (of_mdiobus_child_is_phy(child)) - of_mdiobus_register_phy(mdio, child, addr); + if (of_mdiobus_child_is_phy(child)) { + rc = of_mdiobus_register_phy(mdio, child, addr); + if (rc) + goto unregister; + } } } return 0; + +unregister: + mdiobus_unregister(mdio); + return rc; } EXPORT_SYMBOL(of_mdiobus_register); -- 2.7.4