Am 25.10.2011 23:29, schrieb Frank Schäfer:
> Hi,
>
> I'm trying to use a workqueue in a usb driver for polling the states
> of the device buttons.
> That works fine, but when I disconnect the device, the kernel
> sometimes explodes.
> The machine turns off immediately, without saving a backtrace (I will
> try to make a photo tomorrow)
>
> The code:
>
>
>
> static struct delayed_work poll_work;
>
> static const struct usb_device_id device_table[] = {
> {USB_DEVICE(0x1234, 0x5678)},
> {}
> };
>
> static void poll(struct work_struct *work)
> {
> schedule_delayed_work(&poll_work,
> msecs_to_jiffies(100));
> }
>
> MODULE_DEVICE_TABLE(usb, device_table);
>
> static int test_probe(struct usb_interface *intf,
> const struct usb_device_id *id)
> {
> INIT_DELAYED_WORK(&poll_work, poll);
> schedule_delayed_work(&poll_work,
> msecs_to_jiffies(100));
> return 0;
> }
>
> static void test_disconnect(struct usb_interface *intf)
> {
> cancel_delayed_work_sync(&poll_work);
> }
>
> static struct usb_driver test_driver = {
> .name = MODULE_NAME,
> .id_table = device_table,
> .probe = test_probe,
> .disconnect = test_disconnect,
> };
>
> static int __init test_mod_init(void)
> {
> return usb_register(&test_driver);
> }
>
> static void __exit test_mod_exit(void)
> {
> usb_deregister(&test_driver);
> }
>
> module_init(test_mod_init);
> module_exit(test_mod_exit);
>
>
> What am I doing wrong ?
> Is there anything else I have to do in addition to calling
> cancel_delayed_work_sync() in the disconnect fcn ?
>
> Thanks,
> Frank Schaefer
>
I've managed to make a photo of the backtrace:
http://imageshack.us/photo/my-images/823/img075gv.jpg
Could this be a kernel bug ?
Regards,
Frank
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