From 61fa9dcf9329cb92c220f7b656410fbe5e72f933 Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Sun, 22 Mar 2009 21:30:52 -0700 Subject: [PATCH] ucc_geth: Fix oops when using fixed-link support commit b1c4a9dddf09fe99b8f88252718ac5b357363dc4 ("ucc_geth: Change uec phy id to the same format as gianfar's") introduced a regression in the ucc_geth driver that causes this oops when fixed-link is used: Unable to handle kernel paging request for data at address 0x00000000 Faulting instruction address: 0xc0151270 Oops: Kernel access of bad area, sig: 11 [#1] TMCUTU NIP: c0151270 LR: c0151270 CTR: c0017760 REGS: cf81fa60 TRAP: 0300 Not tainted (2.6.29-rc8) MSR: 00009032 CR: 24024042 XER: 20000000 DAR: 00000000, DSISR: 20000000 TASK = cf81cba0[1] 'swapper' THREAD: cf81e000 GPR00: c0151270 cf81fb10 cf81cba0 00000000 c0272e20 c025f354 00001e80 cf86b08c GPR08: d1068200 cffffb74 06000000 d106c200 42024042 10085148 0fffd000 0ffc81a0 GPR16: 00000001 00000001 00000000 007ffeb0 00000000 0000c000 cf83f36c cf83f000 GPR24: 00000030 cf83f360 cf81fb20 00000000 d106c200 20000000 00001e80 cf83f360 NIP [c0151270] ucc_geth_open+0x330/0x1efc LR [c0151270] ucc_geth_open+0x330/0x1efc Call Trace: [cf81fb10] [c0151270] ucc_geth_open+0x330/0x1efc (unreliable) [cf81fba0] [c0187638] dev_open+0xbc/0x12c [cf81fbc0] [c0187e38] dev_change_flags+0x8c/0x1b0 This patch fixes the issue by removing offending (and somewhat duplicate) code from init_phy() routine, and changes _probe() function to use uec_mdio_bus_name(). Also, since we fully construct phy_bus_id in the _probe() routine, we no longer need ->phy_address and ->mdio_bus fields in ucc_geth_info structure. I wish the patch would be a bit shorter, but it seems like the only way to fix the issue in a sane way. Luckily, the patch has been tested with real PHYs and fixed-link, so no further regressions expected. Reported-by: Joakim Tjernlund Signed-off-by: Anton Vorontsov Tested-by: Joakim Tjernlund Signed-off-by: David S. Miller --- drivers/net/ucc_geth.c | 34 ++++++++++------------------------ drivers/net/ucc_geth.h | 3 +-- 2 files changed, 11 insertions(+), 26 deletions(-) diff --git a/drivers/net/ucc_geth.c b/drivers/net/ucc_geth.c index e87986867ba5..1f61e42c641d 100644 --- a/drivers/net/ucc_geth.c +++ b/drivers/net/ucc_geth.c @@ -1536,32 +1536,15 @@ static void adjust_link(struct net_device *dev) static int init_phy(struct net_device *dev) { struct ucc_geth_private *priv = netdev_priv(dev); - struct device_node *np = priv->node; - struct device_node *phy, *mdio; - const phandle *ph; - char bus_name[MII_BUS_ID_SIZE]; - const unsigned int *id; + struct ucc_geth_info *ug_info = priv->ug_info; struct phy_device *phydev; - char phy_id[BUS_ID_SIZE]; priv->oldlink = 0; priv->oldspeed = 0; priv->oldduplex = -1; - ph = of_get_property(np, "phy-handle", NULL); - phy = of_find_node_by_phandle(*ph); - mdio = of_get_parent(phy); - - id = of_get_property(phy, "reg", NULL); - - of_node_put(phy); - of_node_put(mdio); - - uec_mdio_bus_name(bus_name, mdio); - snprintf(phy_id, sizeof(phy_id), "%s:%02x", - bus_name, *id); - - phydev = phy_connect(dev, phy_id, &adjust_link, 0, priv->phy_interface); + phydev = phy_connect(dev, ug_info->phy_bus_id, &adjust_link, 0, + priv->phy_interface); if (IS_ERR(phydev)) { printk("%s: Could not attach to PHY\n", dev->name); @@ -3629,10 +3612,12 @@ static int ucc_geth_probe(struct of_device* ofdev, const struct of_device_id *ma ug_info->uf_info.irq = irq_of_parse_and_map(np, 0); fixed_link = of_get_property(np, "fixed-link", NULL); if (fixed_link) { - snprintf(ug_info->mdio_bus, MII_BUS_ID_SIZE, "0"); - ug_info->phy_address = fixed_link[0]; + snprintf(ug_info->phy_bus_id, sizeof(ug_info->phy_bus_id), + PHY_ID_FMT, "0", fixed_link[0]); phy = NULL; } else { + char bus_name[MII_BUS_ID_SIZE]; + ph = of_get_property(np, "phy-handle", NULL); phy = of_find_node_by_phandle(*ph); @@ -3643,7 +3628,6 @@ static int ucc_geth_probe(struct of_device* ofdev, const struct of_device_id *ma prop = of_get_property(phy, "reg", NULL); if (prop == NULL) return -1; - ug_info->phy_address = *prop; /* Set the bus id */ mdio = of_get_parent(phy); @@ -3657,7 +3641,9 @@ static int ucc_geth_probe(struct of_device* ofdev, const struct of_device_id *ma if (err) return -1; - snprintf(ug_info->mdio_bus, MII_BUS_ID_SIZE, "%x", res.start); + uec_mdio_bus_name(bus_name, mdio); + snprintf(ug_info->phy_bus_id, sizeof(ug_info->phy_bus_id), + "%s:%02x", bus_name, *prop); } /* get the phy interface type, or default to MII */ diff --git a/drivers/net/ucc_geth.h b/drivers/net/ucc_geth.h index 16cbe42ba43c..611bdef2402b 100644 --- a/drivers/net/ucc_geth.h +++ b/drivers/net/ucc_geth.h @@ -1091,8 +1091,7 @@ struct ucc_geth_info { u32 eventRegMask; u16 pausePeriod; u16 extensionField; - u8 phy_address; - char mdio_bus[MII_BUS_ID_SIZE]; + char phy_bus_id[BUS_ID_SIZE]; u8 weightfactor[NUM_TX_QUEUES]; u8 interruptcoalescingmaxvalue[NUM_RX_QUEUES]; u8 l2qt[UCC_GETH_VLAN_PRIORITY_MAX]; -- 2.20.1