PORT_RESET would have to be applied to the hub device.

There is currently no easy way to reset a USB device, I'm afraid.

	-- Lennart

Giles Lean wrote:
> Wolfgang S. Rupprecht <wolfgang+gnus20041116T203857@dailyplanet.dontspam.wsrcc.com> wrote:
> 
> 
>>After a 5-20 apcupsd status queries, the ugen/usb device driver hangs
>>sleeping on "usbsyn" with negative priority.
> 
> 
> With a different application and different hardware, I can also see a
> ugen hang which appears to be the same:
> 
> UID  PID PPID CPU PRI NI VSZ RSS WCHAN  STAT TT    TIME COMMAND
>   0  885 3191   0  -6  0  72 520 usbsyn D    00 0:00.00 ./transit-dfu -D -R /de
> 
> db> trace/t 0t885
> trace: pid 885  at 0xcb55db6c
> ltsleep(c114e380,10,c070efc6,0,0) at netbsd:ltsleep+0x327
> usbd_transfer(c114e380,2,202,cb43a17c,cb43a17c) at netbsd:usbd_transfer+0xd8
> usbd_do_request_flags_pipe(c1338f80,c1338d80,cb55dea8,0,0) at netbsd:usbd_do_request_flags_pipe+0x5c
> usbd_do_request_flags(c1338f80,cb55dea8,0,0,cb55deb8) at netbsd:usbd_do_request_flags+0x23
> ugen_do_ioctl(c134d000,0,c018556f,cb55dea4,3) at netbsd:ugen_do_ioctl+0x547
> ugenioctl(4010,c018556f,cb55dea4,3,cb4ad338) at netbsd:ugenioctl+0x4a
> spec_ioctl(cb55dd84,10002,25,8,c05dedc0) at netbsd:spec_ioctl+0x46
> VOP_IOCTL(cb5c10b4,c018556f,cb55dea4,3,cab111a4) at netbsd:VOP_IOCTL+0x40
> vn_ioctl(cb491460,c018556f,cb55dea4,cb4ad338,0) at netbsd:vn_ioctl+0x9a
> sys_ioctl(cb43cb58,cb55df64,cb55df5c,0,c129bc00) at netbsd:sys_ioctl+0x122
> syscall_plain() at netbsd:syscall_plain+0x7e
> --- syscall (number 54) ---
> 0x480fb10f:
> 
> This happens both with -current as of last weekend and 2.0 RC5.
> 
> Background:
> 
> I don't know if the ioctl() arguments provided were sensible.  I was
> trying to reset a USB device, and wondered if the following code
> fragment would do it ... comments welcome about this functionality (is
> it possible?  like this?  some other way?) as well as suggestions for
> further troubleshooting the USB hang itself.
> 
>     struct usb_ctl_request reset;
> ...
>     memset(&reset, 0, sizeof(reset));
>     reset.ucr_addr = 0;
>     reset.ucr_request.bmRequestType = UT_WRITE_CLASS_OTHER;
>     reset.ucr_request.bRequest = UR_SET_FEATURE;
>     USETW(reset.ucr_request.wValue, UHF_PORT_RESET);
>     USETW(reset.ucr_request.wIndex, 0);
>     USETW(reset.ucr_request.wLength, 0);
>     reset.ucr_data = 0;
>     reset.ucr_flags = 0;
>     reset.ucr_actlen = 0;
> ...
>     if (ioctl(dev_fd, USB_DO_REQUEST, &reset) == -1)
>         err(EXIT_FAILURE, "ioctl USB_DO_REQUEST (port reset) failed");
> 
> The code hangs in that ioctl().
> 
> Regards,
> 
> Giles
>