Re: [PATCH] xhci: Fix bug in ring expansion free TRB counting.

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On 01/18/2012 07:01 AM, Sarah Sharp wrote:

> The USB 3.0 card reader I have will stall every SCSI command while it is
> empty, so it was only a matter of time before a TD was queued just
> before the link TRB.  That's why my box would always hang with the ring
> expansion patchset and that device.

< snip patch >

Hi Sarah,

While running your andiry-ring-expansion branch from today, I got the panic in
the following screenshot: http://i44.tinypic.com/otkbco.jpg

Unfortunately the first dump has scrolled partway offscreen, but the second
dump seems similar, so maybe it will have the same info.

I don't know if this is related to this particular patch or not.

This happened while I was testing a device with the g_zero gadget using the
testusb program on the host. It happened when I tried to run test 10. Without
the ring expansion patches, test 10 always gave an allocation failure when I
tried to run it.

I'm don't know how reproducible this is. I rebooted and ran test 10 again, and
that time there was no panic. There was a different problem, the test hung, so
I am looking at that now.

-- 
Paul

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