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Merge branch 'sh_eth-next'

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Laurent Pinchart says:

====================
sh_eth: Fix the race between open and MDIO bus registration

This patch series fixes the race condition that exists in the sh_eth driver
between network device open and MDIO bus registration. The actual fix is in
patch 4/5, with previous patches preparing the driver and patch 5/5 cleaning
up an unrelated issue.

I've based the idea on Sergei's attempt to fix the problem and can successfully
boot the Koelsch board over NFS with this series. I might have missed other
issues though, hence the RFC status.

The patches are based on top of the latest net-next master branch.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2014-03-20 17:22:20 -04:00
commit 3907c432cb
1 changed files with 31 additions and 54 deletions
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85
drivers/net/ethernet/renesas/sh_eth.c
View File

@ -873,7 +873,7 @@ static int sh_eth_reset(struct net_device *ndev)
ret = sh_eth_check_reset(ndev);
if (ret)
goto out;
return ret;
/* Table Init */
sh_eth_write(ndev, 0x0, TDLAR);
@ -900,7 +900,6 @@ static int sh_eth_reset(struct net_device *ndev)
EDMR);
}
out:
return ret;
}
@ -1264,7 +1263,7 @@ static int sh_eth_dev_init(struct net_device *ndev, bool start)
/* Soft Reset */
ret = sh_eth_reset(ndev);
if (ret)
goto out;
return ret;
if (mdp->cd->rmiimode)
sh_eth_write(ndev, 0x1, RMIIMODE);
@ -1343,7 +1342,6 @@ static int sh_eth_dev_init(struct net_device *ndev, bool start)
netif_start_queue(ndev);
}
out:
return ret;
}
@ -2583,37 +2581,30 @@ static void sh_eth_tsu_init(struct sh_eth_private *mdp)
}
/* MDIO bus release function */
static int sh_mdio_release(struct net_device *ndev)
static int sh_mdio_release(struct sh_eth_private *mdp)
{
struct mii_bus *bus = dev_get_drvdata(&ndev->dev);
/* unregister mdio bus */
mdiobus_unregister(bus);
/* remove mdio bus info from net_device */
dev_set_drvdata(&ndev->dev, NULL);
mdiobus_unregister(mdp->mii_bus);
/* free bitbang info */
free_mdio_bitbang(bus);
free_mdio_bitbang(mdp->mii_bus);
return 0;
}
/* MDIO bus init function */
static int sh_mdio_init(struct net_device *ndev, int id,
static int sh_mdio_init(struct sh_eth_private *mdp,
struct sh_eth_plat_data *pd)
{
int ret, i;
struct bb_info *bitbang;
struct sh_eth_private *mdp = netdev_priv(ndev);
struct platform_device *pdev = mdp->pdev;
struct device *dev = &mdp->pdev->dev;
/* create bit control struct for PHY */
bitbang = devm_kzalloc(&ndev->dev, sizeof(struct bb_info),
GFP_KERNEL);
if (!bitbang) {
ret = -ENOMEM;
goto out;
}
bitbang = devm_kzalloc(dev, sizeof(struct bb_info), GFP_KERNEL);
if (!bitbang)
return -ENOMEM;
/* bitbang init */
bitbang->addr = mdp->addr + mdp->reg_offset[PIR];
@ -2626,30 +2617,26 @@ static int sh_mdio_init(struct net_device *ndev, int id,
/* MII controller setting */
mdp->mii_bus = alloc_mdio_bitbang(&bitbang->ctrl);
if (!mdp->mii_bus) {
ret = -ENOMEM;
goto out;
}
if (!mdp->mii_bus)
return -ENOMEM;
/* Hook up MII support for ethtool */
mdp->mii_bus->name = "sh_mii";
mdp->mii_bus->parent = &ndev->dev;
mdp->mii_bus->parent = dev;
snprintf(mdp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
mdp->pdev->name, id);
pdev->name, pdev->id);
/* PHY IRQ */
mdp->mii_bus->irq = devm_kzalloc(&ndev->dev,
sizeof(int) * PHY_MAX_ADDR,
mdp->mii_bus->irq = devm_kzalloc(dev, sizeof(int) * PHY_MAX_ADDR,
GFP_KERNEL);
if (!mdp->mii_bus->irq) {
ret = -ENOMEM;
goto out_free_bus;
}
/* register mdio bus */
if (ndev->dev.parent->of_node) {
ret = of_mdiobus_register(mdp->mii_bus,
ndev->dev.parent->of_node);
/* register MDIO bus */
if (dev->of_node) {
ret = of_mdiobus_register(mdp->mii_bus, dev->of_node);
} else {
for (i = 0; i < PHY_MAX_ADDR; i++)
mdp->mii_bus->irq[i] = PHY_POLL;
@ -2662,14 +2649,10 @@ static int sh_mdio_init(struct net_device *ndev, int id,
if (ret)
goto out_free_bus;
dev_set_drvdata(&ndev->dev, mdp->mii_bus);
return 0;
out_free_bus:
free_mdio_bitbang(mdp->mii_bus);
out:
return ret;
}
@ -2782,15 +2765,12 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (unlikely(res == NULL)) {
dev_err(&pdev->dev, "invalid resource\n");
ret = -EINVAL;
goto out;
return -EINVAL;
}
ndev = alloc_etherdev(sizeof(struct sh_eth_private));
if (!ndev) {
ret = -ENOMEM;
goto out;
}
if (!ndev)
return -ENOMEM;
/* The sh Ether-specific entries in the device structure. */
ndev->base_addr = res->start;
@ -2900,6 +2880,13 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
}
}
/* MDIO bus init */
ret = sh_mdio_init(mdp, pd);
if (ret) {
dev_err(&ndev->dev, "failed to initialise MDIO\n");
goto out_release;
}
netif_napi_add(ndev, &mdp->napi, sh_eth_poll, 64);
/* network device register */
@ -2907,13 +2894,6 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
if (ret)
goto out_napi_del;
/* mdio bus init */
ret = sh_mdio_init(ndev, pdev->id, pd);
if (ret) {
dev_err(&ndev->dev, "failed to initialise MDIO\n");
goto out_unregister;
}
/* print device information */
netdev_info(ndev, "Base address at 0x%x, %pM, IRQ %d.\n",
(u32)ndev->base_addr, ndev->dev_addr, ndev->irq);
@ -2922,18 +2902,15 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
return ret;
out_unregister:
unregister_netdev(ndev);
out_napi_del:
netif_napi_del(&mdp->napi);
sh_mdio_release(mdp);
out_release:
/* net_dev free */
if (ndev)
free_netdev(ndev);
out:
return ret;
}
@ -2942,9 +2919,9 @@ static int sh_eth_drv_remove(struct platform_device *pdev)
struct net_device *ndev = platform_get_drvdata(pdev);
struct sh_eth_private *mdp = netdev_priv(ndev);
sh_mdio_release(ndev);
unregister_netdev(ndev);
netif_napi_del(&mdp->napi);
sh_mdio_release(mdp);
pm_runtime_disable(&pdev->dev);
free_netdev(ndev);