Hi alan
Thanx a lot.once again sorry to disturb you.
Please tell me in the practical scenario when urb->status will be
-EPROTOCOL ..?
I am sending some control commonds through control pipe and in the
callback i am getting urb->status error as -EPROTOCOL .and in the
documentation it says
that it's unknown / bitstuff error. what could be the reason behind this.?
My linux kernel version is 2.4.20-8 (REDHAT 9.0)
please give me the reply.
Thanx in advance
Subbu
On Mon, 25 Jul 2005, Alan Stern wrote:
> On Mon, 25 Jul 2005, Subbu wrote:
>
> > Thanx a lot alen and sorry to disturb u again..
> >
> > i am getting the error from urb->status = -EINPROGRESS
> > but usb_submit_urb returning zero.
>
> That's not an error, it's exactly what's supposed to happen -- except that
> you aren't supposed to look at urb->status until your completion function
> is called.
>
> > please tell me what could be the problem.?
> >
> > is it because of invalid pipe address..??or what are things to take care
> > to avoid the -EINPROGRESS error.?
>
> As I said, it's not an error.
>
> If your completion function doesn't get called, that may simply be because
> the USB device doesn't have any data to send or isn't ready to receive the
> data you want to send.
>
> Alan Stern
>
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