netdev - RE: [PATCH net v2 2/2] r8152: reset device when tx timeout

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Date:	Wed, 29 Jul 2015 02:06:40 +0000
From:	Hayes Wang <hayeswang@...ltek.com>
To:	Oliver Neukum <oneukum@...e.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	nic_swsd <nic_swsd@...ltek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH net v2 2/2] r8152: reset device when tx timeout

 Oliver Neukum [mailto:oneukum@...e.com]
> Sent: Tuesday, July 28, 2015 8:59 PM
[...]
> > > >  static void rtl8152_tx_timeout(struct net_device *netdev)  {
> > > >         struct r8152 *tp = netdev_priv(netdev);
> > > > -       int i;
> > > >
> > > >         netif_warn(tp, tx_err, netdev, "Tx timeout\n");
> > > > -       for (i = 0; i < RTL8152_MAX_TX; i++)
> > > > -               usb_unlink_urb(tp->tx_info[i].urb);
> > > > +
> > > > +       usb_queue_reset_device(tp->intf);
> > > > +       cancel_delayed_work(&tp->schedule);
> > >
> > > Sorry to bother you again, but this looks wrong.
> > > You want to cancel first. There is no point in running any work
> > > before the reset is done. It will undo any progress anyway.
> >
> > Excuse me. Do you mean I don't need cancel the other work because it
> > wouldn't be run before the reset is finished?
> 
> No, whatever the other work will do, the reset will undo.

Excuse me. I don't understand why I couldn't use usb_queue_reset_device() directly.
Why the reset will undo? 

Best Regards,
Hayes