netdev - Re: [Pv-drivers] [PATCH] vmxnet3: set carrier state properly on probe

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Message-ID: <14488768.c79P4XbKCv@dtor-d630.eng.vmware.com>
Date:	Tue, 29 Jan 2013 10:54:28 -0800
From:	Dmitry Torokhov <dtor@...are.com>
To:	pv-drivers@...are.com
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	Neil Horman <nhorman@...driver.com>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [Pv-drivers] [PATCH] vmxnet3: set carrier state properly on probe

On Tuesday, January 29, 2013 05:54:11 PM Ben Hutchings wrote:
> On Fri, 2013-01-25 at 15:54 -0500, Neil Horman wrote:
> > vmxnet3 fails to set netif_carrier_off on probe, meaning that when an
> > interface is opened the __LINK_STATE_NOCARRIER bit is already cleared,
> > and so /sys/class/net/<ifname>/operstate remains in the unknown state. 
> > Correct this by setting netif_carrier_off on probe, like other drivers
> > do.
> > 
> > Also, while we're at it, lets remove the netif_carrier_ok checks from the
> > link_state_update function, as that check is atomically contained within
> > the netif_carrier_[on|off] functions anyway
> > 
> > Tested successfully by myself
> > 
> > Signed-off-by: Neil Horman <nhorman@...driver.com>
> > CC: "David S. Miller" <davem@...emloft.net>
> > CC: "VMware, Inc." <pv-drivers@...are.com>
> > ---
> > 
> >  drivers/net/vmxnet3/vmxnet3_drv.c | 7 +++----
> >  1 file changed, 3 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c
> > b/drivers/net/vmxnet3/vmxnet3_drv.c index b1c90f8..66c26a9 100644
> > --- a/drivers/net/vmxnet3/vmxnet3_drv.c
> > +++ b/drivers/net/vmxnet3/vmxnet3_drv.c
> 
> [...]
> 
> > @@ -3067,6 +3065,7 @@ vmxnet3_probe_device(struct pci_dev *pdev,
> > 
> >  		goto err_register;
> >  	
> >  	}
> > 
> > +	netif_carrier_off(netdev);
> > 
> >  	vmxnet3_check_link(adapter, false);
> >  	return 0;
> 
> You should do this before calling register_netdev(), otherwise the link
> state change can race with vmxnet3_open().

Hmm, is it safe to do before the network device is registered? The rest
of the drivers (e1000, tg3, etc) seem to be doing netif_carrier_off()
in open() rather than probe() and then do link checks.

Thanks,
Dmitry

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