Oliver Neukum escribió:
> Am Donnerstag, 3. Mai 2007 18:35 schrieb Alex Villacís Lasso:
>
>> /* Coming out of suspend, so reset hardware */
>> static int kingsun_resume(struct usb_interface *intf)
>> {
>> struct kingsun_cb *kingsun = usb_get_intfdata(intf);
>>
>> if (kingsun->rx_urb != NULL) usb_submit_urb(kingsun->rx_urb,
>> GFP_KERNEL);
>> netif_device_attach(kingsun->netdev);
>>
>> return 0;
>> }
>>
>
> Do you really want to submit the URB whether the device has been opened
> or not?
>
> Regards
> Oliver
>
>
I don't think an URB would be submitted if the device is not opened:
- The code in kingsun_resume() checks for rx_urb != NULL before
submitting the URB. So your question becomes one of whether rx_urb can
be not NULL while the device is not opened.
- In kingsun_probe() line 490, rx_urb is assigned NULL shortly after
allocating a driver structure. After the probe function returns, rx_urb
is still NULL, since this probe does not allocate any URBs. Therefore,
if the device is suspended and then resumed right after kingsun_probe(),
rx_urb is NULL and therefore no URB is submitted. I am assuming here
that an explicit call to kingsun_net_open() is required to actually open
the device.
- kingsun_net_open() allocates the URB and (in successful completion)
leaves the device in the open state. A suspend/resume cycle here will
submit rx_urb, but the interface is supposed to be opened.
- kingsun_net_close() kills and frees the URBs, and sets their pointers
to NULL unconditionally. After this, a suspend/resume cycle will find
rx_urb == NULL and therefore no URB is submitted
- kingsun_disconnect() also kills and frees the URBs, and then sets
their pointers to NULL, so same argument as in kingsun_net_close()
Am I missing some scenario here?
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