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SubjectRe: [PATCH 2/2] netdev/fec: fix ifconfig eth0 down hang issue
Since this patch is for another bug and doesn't depend on my first one patch.
Could you please review this?

Thanks,
-Bryan

On 05/07/2010 10:27 AM, Bryan Wu wrote:
> BugLink: http://bugs.launchpad.net/bugs/559065
>
> In fec open/close function, we need to use phy_connect and phy_disconnect
> operation before we start/stop phy. Otherwise it will cause system hang.
>
> Only call fec_enet_mii_probe() in open function, because the first open
> action will cause NULL pointer error.
>
> Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
> ---
> drivers/net/fec.c | 28 ++++++++++++++++------------
> 1 files changed, 16 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/net/fec.c b/drivers/net/fec.c
> index 9c58f6b..af4243f 100644
> --- a/drivers/net/fec.c
> +++ b/drivers/net/fec.c
> @@ -678,6 +678,8 @@ static int fec_enet_mii_probe(struct net_device *dev)
> struct phy_device *phy_dev = NULL;
> int phy_addr;
>
> + fep->phy_dev = NULL;
> +
> /* find the first phy */
> for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
> if (fep->mii_bus->phy_map[phy_addr]) {
> @@ -708,6 +710,11 @@ static int fec_enet_mii_probe(struct net_device *dev)
> fep->link = 0;
> fep->full_duplex = 0;
>
> + printk(KERN_INFO "%s: Freescale FEC PHY driver [%s] "
> + "(mii_bus:phy_addr=%s, irq=%d)\n", dev->name,
> + fep->phy_dev->drv->name, dev_name(&fep->phy_dev->dev),
> + fep->phy_dev->irq);
> +
> return 0;
> }
>
> @@ -753,13 +760,8 @@ static int fec_enet_mii_init(struct platform_device *pdev)
> if (mdiobus_register(fep->mii_bus))
> goto err_out_free_mdio_irq;
>
> - if (fec_enet_mii_probe(dev) != 0)
> - goto err_out_unregister_bus;
> -
> return 0;
>
> -err_out_unregister_bus:
> - mdiobus_unregister(fep->mii_bus);
> err_out_free_mdio_irq:
> kfree(fep->mii_bus->irq);
> err_out_free_mdiobus:
> @@ -912,7 +914,12 @@ fec_enet_open(struct net_device *dev)
> if (ret)
> return ret;
>
> - /* schedule a link state check */
> + /* Probe and connect to PHY when open the interface */
> + ret = fec_enet_mii_probe(dev);
> + if (ret) {
> + fec_enet_free_buffers(dev);
> + return ret;
> + }
> phy_start(fep->phy_dev);
> netif_start_queue(dev);
> fep->opened = 1;
> @@ -926,10 +933,12 @@ fec_enet_close(struct net_device *dev)
>
> /* Don't know what to do yet. */
> fep->opened = 0;
> - phy_stop(fep->phy_dev);
> netif_stop_queue(dev);
> fec_stop(dev);
>
> + if (fep->phy_dev)
> + phy_disconnect(fep->phy_dev);
> +
> fec_enet_free_buffers(dev);
>
> return 0;
> @@ -1293,11 +1302,6 @@ fec_probe(struct platform_device *pdev)
> if (ret)
> goto failed_register;
>
> - printk(KERN_INFO "%s: Freescale FEC PHY driver [%s] "
> - "(mii_bus:phy_addr=%s, irq=%d)\n", ndev->name,
> - fep->phy_dev->drv->name, dev_name(&fep->phy_dev->dev),
> - fep->phy_dev->irq);
> -
> return 0;
>
> failed_register:




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