Am Montag, 7. Dezember 2009 19:25:14 schrieb Francesco Lavra:
> --- a/drivers/usb/class/cdc-acm.c 2009-12-07 16:22:20.000000000 +0100
> +++ b/drivers/usb/class/cdc-acm.c 2009-12-07 19:11:43.000000000 +0100
> @@ -1460,6 +1460,23 @@ err_out:
> return rv;
> }
>
> +static int acm_reset_resume(struct usb_interface *intf)
> +{
> + struct acm *acm = usb_get_intfdata(intf);
> + struct tty_struct *tty;
> +
> + mutex_lock(&open_mutex);
That you must not do. acm_tty_open() calls usb_autopm_get_interface()
with open_mutex held. For any device with USB_QUIRK_RESET_RESUME
this can deadlock.
Regards
Oliver
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
