[PATCH] netdev/fec: fix ifconfig eth0 down hang issue (v4)
Bryan Wu
bryan.wu at canonical.com
Fri Apr 23 03:49:50 UTC 2010
Bryan Wu wrote:
> BugLink: http://bugs.launchpad.net/bugs/559065
>
> v4:
> - don't touch suspend/resume functions in this patch
> - set fep->phy_dev = NULL in the fec_enet_mii_probe() entry
>
> v3:
> if fec_enet_mii_probe() fails, we should exit the open and resume functions
> properly and give up further operations without a proper PHY connected.
>
> v2:
> Check fec_enet_mii_probe() return value directly, instead of fep->phy_dev
>
> v1:
> In ethernet connection open/close function, we need to use phy_connect
> and phy_disconnect operation before we start/stop phy. Otherwise it will
> cause system hang. Also suspend/resume needs the same fix.
>
> Signed-off-by: Bryan Wu <bryan.wu at canonical.com>
> ---
> drivers/net/fec.c | 14 +++++++++++++-
> 1 files changed, 13 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/net/fec.c b/drivers/net/fec.c
> index 2280373..8f0237b 100644
> --- a/drivers/net/fec.c
> +++ b/drivers/net/fec.c
> @@ -691,6 +691,8 @@ 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]) {
> @@ -929,7 +931,13 @@ fec_enet_open(struct net_device *dev)
> return ret;
>
> /* schedule a link state check */
> + 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;
> return 0;
> @@ -942,10 +950,13 @@ 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);
> clk_disable(fep->clk);
>
> @@ -1409,6 +1420,7 @@ fec_resume(struct platform_device *dev)
> {
> struct net_device *ndev = platform_get_drvdata(dev);
> struct fec_enet_private *fep;
> + int ret;
>
>
What'a a mess. Sorry, please ignore this one. I will send out a new one
soon.
-Bryan
> if (ndev) {
> fep = netdev_priv(ndev);
>
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