* Arvid Brodin | 2011-07-13 03:54:39 [+0200]:
>Hi,
Hi,
>The problem is that low- and full-speed devices stop working while running the
>testusb suite. It looks like this:
>
># ./testusb -a
>...
>After this, plugging in a full speed device yields this (on any port):
>/var/log/messages:
>usb 1-1.2: new full speed USB device using isp1760 and address 23
>usb 1-1.2: device descriptor read/64, error -110
>hub 1-1:1.0: unable to enumerate USB device on port 2
>
>High speed devices however works just fine (on any port).
You have only one port which you access via isp1760's hub code. The
three external ports are behind the external hub. From this it seems
that the hub wants to remain in HighSpeed.
>The usbmon dump ends with one line of -ENOENT (-2) for every line of "error 110"
>in the output above:
>
>...
>93e26a80 2856118575 C Bo:1:003:2 0 512 >
>93e26a80 2856119258 C Bo:1:003:2 0 512 >
>93e26a80 2861121006 C Co:1:003:0 -2 0
There is no submit to this? Could it be that the pipe is "down" and you
never subit the URB in the first place?
>93e26a80 2861129835 S Co:1:003:0 s 01 0b 0000 0000 0000 0
>93e26a80 2866200342 C Co:1:003:0 -2 0
>
>Any idea what could be causing this? (The driver itself never sets urb->status
>to -ENOENT, but I can see that this is done in the usb core code for numerous
>reasons.)
I guess another prinkt would help :)
>Another clue may be that with the addition of this printk to core/urb.c, the
>error does not occur, so it would have to be a timing dependent issue:
>
> void usb_kill_urb(struct urb *urb)
> {
> might_sleep();
> if (!(urb && urb->dev && urb->ep))
> return;
> atomic_inc(&urb->reject);
>
>+ printk(KERN_ERR "E\n");
> usb_hcd_unlink_urb(urb, -ENOENT);
> wait_event(usb_kill_urb_queue, atomic_read(&urb->use_count) == 0);
>
> atomic_dec(&urb->reject);
> }
> EXPORT_SYMBOL_GPL(usb_kill_urb);
Is it possible that since you defer the unlinking you don't interrupt
the internal HUB in the middle of whatever it is doing? Maybe the way
the transfers are unlinked is something that confuses the internal hub.
>Thanks,
>Arvid Brodin
>Enea Services Stockholm AB
Sebastian
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