On Thu, 2010-09-02 at 08:50 +0800, Liang Li wrote:
> On Wed, Sep 01, 2010 at 02:42:30PM +0100, Ben Hutchings wrote:
> > On Wed, 2010-09-01 at 09:43 +0800, Liang Li wrote:
> > > It's common sense that when we should do change to driver ring
> > > desc/buffer etc only after 'stop/shutdown' the device. When we
> > > do change while devices/driver is running, kernel oops occur:
> > [...]
> > > - ug_info->bdRingLenRx[queue] = ring->rx_pending;
> > > - ug_info->bdRingLenTx[queue] = ring->tx_pending;
> > > -
> > > if (netif_running(netdev)) {
> > > - /* FIXME: restart automatically */
> > > - printk(KERN_INFO
> > > - "Please re-open the interface.\n");
> > > + u16 rx_t;
> > > + u16 tx_t;
> > > + printk(KERN_INFO "Stopping interface %s.\n", netdev->name);
> > > + ucc_geth_close(netdev);
> > > +
> > > + rx_t = ug_info->bdRingLenRx[queue];
> > > + tx_t = ug_info->bdRingLenTx[queue];
> > > +
> > > + ug_info->bdRingLenRx[queue] = ring->rx_pending;
> > > + ug_info->bdRingLenTx[queue] = ring->tx_pending;
> > > +
> > > + printk(KERN_INFO "Reactivating interface %s.\n", netdev->name);
> > > + ret = ucc_geth_open(netdev);
> > > + if (ret) {
> > > + printk(KERN_WARNING "uec_set_ringparam: set ring param
> > > for running"
> > > + " interface %s failed. Please try to
> > > make the interface "
> > > + " down, then try again.\n",
> > > netdev->name);
> > > + ug_info->bdRingLenRx[queue] = rx_t;
> > > + ug_info->bdRingLenTx[queue] = tx_t;
> > > + }
> > [...]
> >
> > Bringing the interface down will call ucc_geth_close(), which will try
> > to free resources that have not been allocated!
>
> Sorry, I did not understand you on this point. There is no
> ucc_geth_close when 'open fail'. What you mean here exactly?
[...]
Read your own warning.
Ben.
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
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