Re: failure of usbmon in rc8 (was:Re: Sensebuffer from resumed storage device)

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On Wed, 24 Feb 2010, Oliver Neukum wrote:

> Hi Pete,
> 
> it seems like usbmon has been broken. This is the trace in 2.6.31.11.
> The returned sense makes sense

> As you can see the sense buffer is zeroed.
> The SCSI layer still reports that it got ASC 28 ASCQ 00. That makes it very likely
> that the malfunction is in usbmon and that the sense buffer that actually goes over
> the wire is identical in both cases.
> Do you want me to bisect, or do you have any others tests to rather run?

I can't duplicate your results here, probably because my system doesn't 
have highmem.

The most likely culprit is commit
b375e1169d8ecc9e9db3ecba8147d484b5510833 (USB: add scatter-gather
support to usbmon).  Related to it is commit
40f8db8f8f5af2cafeb976ae15e11aca641a931d (USB: EHCI: add native
scatter-gather support) -- you shouldn't revert the first without 
reverting the second.

Alan Stern

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