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Message-ID: <20100428195701.GA3461@Chamillionaire.breakpoint.cc>
Date: Wed, 28 Apr 2010 21:57:01 +0200
From: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
To: David Miller <davem@...emloft.net>
Cc: ralf@...ux-mips.org, netdev@...r.kernel.org
Subject: [PATCH v2] net/sb1250: register mdio bus in probe
"ifconfig eth0 up && ifconfig eth0 down" triggers:
| kobject (a8000000cfa5a480): tried to init an initialized object, something is seriously wrong.
| Call Trace:
| [<ffffffff8010aabc>] dump_stack+0x8/0x34
| [<ffffffff80293128>] kobject_init+0xe8/0xf0
| [<ffffffff802d922c>] device_initialize+0x2c/0x98
| [<ffffffff802d9cfc>] device_register+0x14/0x28
| [<ffffffff80312cd4>] mdiobus_register+0xdc/0x1e0
| [<ffffffff80314cf0>] sbmac_open+0x58/0x220
| [<ffffffff803519bc>] __dev_open+0x11c/0x180
| [<ffffffff8034d578>] __dev_change_flags+0x120/0x180
| [<ffffffff80351848>] dev_change_flags+0x20/0x78
| [<ffffffff803a753c>] devinet_ioctl+0x7cc/0x820
| [<ffffffff80339ac8>] sock_do_ioctl+0x38/0x90
| [<ffffffff8033a258>] compat_sock_ioctl_trans+0x408/0x1030
| [<ffffffff8033af30>] compat_sock_ioctl+0xb0/0xd0
| [<ffffffff80208b08>] compat_sys_ioctl+0xa0/0x18b8
| [<ffffffff80102f94>] handle_sys+0x114/0x130
|
| sb1250-mac-mdio: probed
mdiobus_register() calls device_register() which initializes the kobj of
the device. mdiobus_unregister() calls only device_del() so we have one
reference left. That one is leaving with mdiobus_free() which is only
called on remove.
Since I don't see any reason why mdiobus_register()/mdiobus_unregister()
should happen in ->open()/->close() I move them to probe & exit.
Signed-off-by: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
---
v2: register mdio bus before registering netdev device
drivers/net/sb1250-mac.c | 67 ++++++++++++++++++++++-----------------------
1 files changed, 33 insertions(+), 34 deletions(-)
diff --git a/drivers/net/sb1250-mac.c b/drivers/net/sb1250-mac.c
index 3f882d5..b0161b4 100644
--- a/drivers/net/sb1250-mac.c
+++ b/drivers/net/sb1250-mac.c
@@ -2256,17 +2256,36 @@ static int sbmac_init(struct platform_device *pldev, long long base)
sc->mii_bus = mdiobus_alloc();
if (sc->mii_bus == NULL) {
- sbmac_uninitctx(sc);
- return -ENOMEM;
+ err = -ENOMEM;
+ goto uninit_ctx;
}
+ sc->mii_bus->name = sbmac_mdio_string;
+ snprintf(sc->mii_bus->id, MII_BUS_ID_SIZE, "%x", idx);
+ sc->mii_bus->priv = sc;
+ sc->mii_bus->read = sbmac_mii_read;
+ sc->mii_bus->write = sbmac_mii_write;
+ sc->mii_bus->irq = sc->phy_irq;
+ for (i = 0; i < PHY_MAX_ADDR; ++i)
+ sc->mii_bus->irq[i] = SBMAC_PHY_INT;
+
+ sc->mii_bus->parent = &pldev->dev;
+ /*
+ * Probe PHY address
+ */
+ err = mdiobus_register(sc->mii_bus);
+ if (err) {
+ printk(KERN_ERR "%s: unable to register MDIO bus\n",
+ dev->name);
+ goto free_mdio;
+ }
+ dev_set_drvdata(&pldev->dev, sc->mii_bus);
+
err = register_netdev(dev);
if (err) {
printk(KERN_ERR "%s.%d: unable to register netdev\n",
sbmac_string, idx);
- mdiobus_free(sc->mii_bus);
- sbmac_uninitctx(sc);
- return err;
+ goto unreg_mdio;
}
pr_info("%s.%d: registered as %s\n", sbmac_string, idx, dev->name);
@@ -2282,19 +2301,15 @@ static int sbmac_init(struct platform_device *pldev, long long base)
pr_info("%s: SiByte Ethernet at 0x%08Lx, address: %pM\n",
dev->name, base, eaddr);
- sc->mii_bus->name = sbmac_mdio_string;
- snprintf(sc->mii_bus->id, MII_BUS_ID_SIZE, "%x", idx);
- sc->mii_bus->priv = sc;
- sc->mii_bus->read = sbmac_mii_read;
- sc->mii_bus->write = sbmac_mii_write;
- sc->mii_bus->irq = sc->phy_irq;
- for (i = 0; i < PHY_MAX_ADDR; ++i)
- sc->mii_bus->irq[i] = SBMAC_PHY_INT;
-
- sc->mii_bus->parent = &pldev->dev;
- dev_set_drvdata(&pldev->dev, sc->mii_bus);
-
return 0;
+unreg_mdio:
+ mdiobus_unregister(sc->mii_bus);
+ dev_set_drvdata(&pldev->dev, NULL);
+free_mdio:
+ mdiobus_free(sc->mii_bus);
+uninit_ctx:
+ sbmac_uninitctx(sc);
+ return err;
}
@@ -2320,16 +2335,6 @@ static int sbmac_open(struct net_device *dev)
goto out_err;
}
- /*
- * Probe PHY address
- */
- err = mdiobus_register(sc->mii_bus);
- if (err) {
- printk(KERN_ERR "%s: unable to register MDIO bus\n",
- dev->name);
- goto out_unirq;
- }
-
sc->sbm_speed = sbmac_speed_none;
sc->sbm_duplex = sbmac_duplex_none;
sc->sbm_fc = sbmac_fc_none;
@@ -2360,11 +2365,7 @@ static int sbmac_open(struct net_device *dev)
return 0;
out_unregister:
- mdiobus_unregister(sc->mii_bus);
-
-out_unirq:
free_irq(dev->irq, dev);
-
out_err:
return err;
}
@@ -2553,9 +2554,6 @@ static int sbmac_close(struct net_device *dev)
phy_disconnect(sc->phy_dev);
sc->phy_dev = NULL;
-
- mdiobus_unregister(sc->mii_bus);
-
free_irq(dev->irq, dev);
sbdma_emptyring(&(sc->sbm_txdma));
@@ -2663,6 +2661,7 @@ static int __exit sbmac_remove(struct platform_device *pldev)
unregister_netdev(dev);
sbmac_uninitctx(sc);
+ mdiobus_unregister(sc->mii_bus);
mdiobus_free(sc->mii_bus);
iounmap(sc->sbm_base);
free_netdev(dev);
--
1.6.6.1
--
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