Re: [linux-usb-devel] Re: USB storage problems on OHCI..

[David Brownell <david-b@pacbell.net>]

Linus Torvalds wrote:
> On Mon, 22 Sep 2003, David Brownell wrote:
> 
>>In this case, because it's not "EHCI + USB 2.0 hub", it's still using
>>the OHCI companion controller.  So that wasn't a new case.
> 
> 
> Ok. Here's the broken case with an added usb-2 hub in between. It is 
> indeed a bit different.

Yes.  Instead of getting 64/128 bytes transferred, with -EOVERFLOW
reported, it gets 0/128, with -EPIPE.  And the recovery got a bit
confused; it's a STALL but not from the device, it's from the hub.

It might be worth making EHCI use a different code in that case,
if this class of TT-related errors starts to be trouble.


> Again, this case worked fine with the sd.c changes, so it does seem to be 
> all related to "big" transfers out of the mode page.

Or at any rate, "big enough" to confuse the device.

Thanks for the additional test results.

- Dave