[PATCH] netdev/fec: fix ifconfig eth0 down hang issue (v4)

Bryan Wu bryan.wu at canonical.com
Fri Apr 23 08:02:06 UTC 2010


This change will cause kernel oops. Will rework a patch and send it out after 
testing.

Sorry,
-Bryan

On 04/23/2010 11:48 AM, 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 |   13 ++++++++++++-
>   1 files changed, 12 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/net/fec.c b/drivers/net/fec.c
> index 2280373..dff9d96 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);
>





More information about the kernel-team mailing list