On Thu, Feb 13, 2014 at 11:45:16AM -0500, Alan Stern wrote:
> @@ -1074,6 +1089,7 @@ static int proc_clearhalt(struct dev_sta
> ret = checkintf(ps, ret);
> if (ret)
> return ret;
> + check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
> if (ep & USB_DIR_IN)
> pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
> else
In documentation is written:
USBDEVFS_CLEAR_HALT
Clears endpoint halt (stall) and
resets the endpoint toggle. This is only
meaningful for bulk or interrupt endpoints.
The ioctl parameter is an integer endpoint number
(1 to 15, as identified in an endpoint descriptor),
masked with USB_DIR_IN when referring to an endpoint which
sends data to the host from the device.
Use this on bulk or interrupt endpoints which have
stalled, returning <emphasis>-EPIPE</emphasis> status
to a data transfer request.
Do not issue the control request directly, since
that could invalidate the host's record of the
data toggle.
Is possible that user space driver can issue dozen of URBs , then get
-EPIPE for last of them, and then call CLEAR_HALT ? According
documentation, this behaviour should be correct. Or peraps can not issue
more than one URB for USB_DIR_IN endpoint and should not do CLEAR_HALT
for USB_DIR_OUT endpoints ?
Stanislaw
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