Quirk for a USB mass storage device

[Hans Petter Selasky]

On Friday 28 October 2011 07:27:19 Gustau Pérez wrote:
> Al 27/10/2011 20:28, En/na Hans Petter Selasky ha escrit:
> > On Thursday 27 October 2011 10:12:46 Gustau Pérez wrote:
> >>    Hi,
> >>    
> >>    I'm running FreeBSD 10.0 r226042 on AMD64 and I'm having problems
> >> 
> >> with the following device:
> >>         umass0: <Kingston DataTraveler 200, class 0/0, rev 2.00/1.10,
> >> 
> >> addr 7> on usbus0
> >> 
> >>         umass0:  SCSI over Bulk-Only; quirks = 0x4001
> >>         umass0: Get Max Lun not supported (USB_ERR_TIMEOUT)
> >>         umass0:5:0:-1: Attached to scbus5
> >>    
> >>    as you can see, UQ_MSC_NO_GETMAXLUN should be set to use the device.
> >> 
> >> As it is a 64Gb mass storage I would like  to use it.
> >> 
> >>    I tried to manually add the quirk and it worked. Later on I tried
> >> 
> >> with 9.0Beta2/i386 on the same machine and the problem also appeared. So
> >> I made a patch (which works on CURRENT, did not try with STABLE) to add
> >> the quirk, which is attached.
> >> 
> >>    Hans: is it necessary to fill a PR with the patch or would it be
> >> 
> >> enough with the inline patch?
> > 
> > Hi Gustau,
> > 
> > Does this device work at all without this patch?
> > 
> > I was thinking to auto detect this behaviour instead.
> > 
> > --HPS
> 
>    It did not work without the quirk. The corresponding /dev/daX device
> never appeared. After manually setting the quirk I could use it by
> unplugging and re-plugging the device.
> 
>    I see a few number of devices using this quirk. However many of them
> use other quirks too. So auto detecting this behavior would be good for
> those pseudo-scsi devices having only problems with LUN detection.
> 
>    Please let me know if you want me to test any patch or you want me to
> check any code.
> 
>    Gus

Try to set the no synchronize cache quirk instead. Does that solve the problem 
aswell?

--HPS