Re: Unable to access USB mass storage device with xhci. okay with ehci

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On Fri, 3 Apr 2015, Steve Bangert wrote:

> On Fri, 2015-04-03 at 09:59 -0400, Alan Stern wrote:
> > On Fri, 3 Apr 2015, Steve Bangert wrote:
> > 
> > > Alan or Mathias,
> > > 
> > >  Machine is a 64 bit Dell Inspiron with Intel chips running Fedora 3.19.3 kernel
> > > 
> > > Disabling the uas driver is no help. Any help is appreciated.
> > 
> > Can you post a usbmon trace with uas disabled?  And a similar usbmon 
> > trace using EHCI?
> > 
> > Alan Stern
> 
> 
> usbmon trace w/uas driver disabled:

...
> ffff8800ce9bf000 3292872775 S Ci:2:002:0 s 80 06 0300 0000 00ff 255 <
> ffff8800ce9bf000 3292872853 C Ci:2:002:0 0 4 = 04030904
> ffff8800ce9bf000 3292872893 S Ci:2:002:0 s 80 06 0303 0409 00ff 255 <
> ffff8800ce9bf000 3292872938 C Ci:2:002:0 0 32 = 20035500 53004200 33002d00 53004100 54004100 2d005500 41005300 50003100
> ffff8800ce9bf000 3292872985 S Ci:2:002:0 s 80 06 0302 0409 00ff 255 <
> ffff8800ce9bf000 3292873049 C Ci:2:002:0 0 18 = 12035000 6c007500 67006100 62006c00 6500
> ffff8800ce9bf000 3292873087 S Ci:2:002:0 s 80 06 0301 0409 00ff 255 <
> ffff8800ce9bf000 3292873168 C Ci:2:002:0 0 26 = 1a033100 32003300 34003500 36003700 38003900 30003100 3400
> ffff8800ce9bfb40 3292876140 S Co:2:002:0 s 00 09 0001 0000 0000 0
> ffff8800ce9bfb40 3292876177 C Co:2:002:0 0 0
> ffff8800ce9bf9c0 3292876382 S Ci:2:001:0 s a3 00 0000 0002 0004 4 <
> ffff8800ce9bf9c0 3292876397 C Ci:2:001:0 0 4 = 03020000

Is that really all?  Was there a "UAS is blacklisted for this device"  
line in the kernel log?  It looks like the usb-storage driver didn't do
anything at all with the device.

This seems to be a separate problem from the original one.

> usbmon trace using ehci:
...

Comparing this with the original usbmon trace, it looks like the first
problem in the xHCI trace shows up when we try to transfer more than
122880 bytes.  A 196608-byte transfer has to be aborted after 30 
seconds, and only 65536 bytes were received.  (Note that 122880-byte 
transfers succeeded in both the EHCI and xHCI-with-a-USB-2-cable 
traces.)

Perhaps this drive needs some sort of max_sectors restriction.

Alan Stern

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