Re: Device failing to enumerate with EHCI

Alan Stern <[email protected]>
Newsgroups gmane.linux.usb.devel
Message-ID <[email protected]>
On Sat, 24 Mar 2007, Oliver Neukum wrote:

> Am Samstag, 24. März 2007 04:21 schrieb Alan Stern:
> > I don't see any easy way to tell.  The spec doesn't offer any good way to 
> > tell the difference between one type of stall and the other.  In fact, the 
> > only way seems to be to send another request that _should_ always succeed 
> > and see whether it does.
> 
> So why not simply clear the halt anyway? If it doesn't work, no harm is done.

Don't be so sure.  Clearing a halt on endpoint 0 is sufficiently unusual 
that I bet some devices will fail to handle it and will crash.

If you want to test what happens with this particular device, go right 
ahead.  Maybe it will fix the failure to enumerate with EHCI.  But in 
general my feeling is that we should leave well enough alone.

Alan Stern


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