On Thu, 06 May 2010 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> On Thu, 6 May 2010, Bruno [UTF-8] Prémont wrote:
>
> > > Bruno, can you confirm that the hang occurs during one of those
> > > cancel_work_sync() calls?
> >
> > No, it's not one of the cancel_work_sync() that hangs but it's the
> > del_timer_sync() right before them that hangs!
> > (del_timer_sync() also hangs if I put it last, so the cancel_work_sync()
> > don't hang anything)
> >
> > static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
> > {
> > del_timer_sync(&usbhid->io_retry); /* this one never returns */
> > cancel_work_sync(&usbhid->restart_work);
> > cancel_work_sync(&usbhid->reset_work);
> > }
>
> Okay, I see what the problem is. In usbhid_start() there's a bunch of
> statements initializing parts of the usbhid structure. When probing
> fails those statements don't get executed, so the timer and workqueue
> things aren't set up properly.
>
> This patch should fix it.
This very much reminds me the resume issue with the same keyboard on a
!CONFIG_SMP system back in February when the fix was to copy/move
usbhid->intf = intf; from usbhid_start() to usbhid_probe()!
Hopefully these are all those initializations that need to be taken
care of...
With this patch system now it passes "devices" level pm_test as well as
full suspend process, even multiple times in a row (though it's still
damn slow to resume IF no_console_suspend is passed to kernel - radeon
KMS?, but that's a new branch from start of this thread)
Reported-by: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>
Tested-By: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>
Now it can continue hunting the next issues preventing smooth S3
experience...
Thanks,
Bruno
> Index: usb-2.6/drivers/hid/usbhid/hid-core.c
> ===================================================================
> --- usb-2.6.orig/drivers/hid/usbhid/hid-core.c
> +++ usb-2.6/drivers/hid/usbhid/hid-core.c
> @@ -998,13 +998,6 @@ static int usbhid_start(struct hid_devic
> }
> }
>
> - init_waitqueue_head(&usbhid->wait);
> - INIT_WORK(&usbhid->reset_work, hid_reset);
> - INIT_WORK(&usbhid->restart_work, __usbhid_restart_queues);
> - setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
> -
> - spin_lock_init(&usbhid->lock);
> -
> usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
> if (!usbhid->urbctrl) {
> ret = -ENOMEM;
> @@ -1180,6 +1173,12 @@ static int usbhid_probe(struct usb_inter
> usbhid->intf = intf;
> usbhid->ifnum = interface->desc.bInterfaceNumber;
>
> + init_waitqueue_head(&usbhid->wait);
> + INIT_WORK(&usbhid->reset_work, hid_reset);
> + INIT_WORK(&usbhid->restart_work, __usbhid_restart_queues);
> + setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
> + spin_lock_init(&usbhid->lock);
> +
> ret = hid_add_device(hid);
> if (ret) {
> if (ret != -ENODEV)
>
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