Re: Bug in EHCI split-interrupt handling

Pete Zaitcev <[email protected]>
Newsgroups gmane.linux.usb.devel
Organization Red Hat, Inc.
Message-ID <[email protected]>
On Tue, 24 Jul 2007 15:44:23 -0400 (EDT), Alan Stern <[email protected]> wrote:

> 	http://bugzilla.kernel.org/show_bug.cgi?id=8535
> 
> contains logs suggestive of problems with EHCI split-interrupt
> handling.  See in particular comment #33; the usbmon log in comment #32
> contains a line in which a low-speed interrupt URB returns with status
> equal to 0 and actual_length set to -4.

Nicolas sent me a trace out of band which had a similar entry:
ffff8100057f6100 1467276128 C Ii:2:004:1 0:8 -4

> Obviously this should never happen.  Can anybody offer tips on where to 
> go searching through the driver code for a solution?

I'm going to double-check that usbmon is not deceiving you. It sure
looks totally bogus. Maybe I mixed up fields in a union somewhere.

-- Pete

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