[Bug 215333] New: UAS keeps resetting disks

[Bug 215333] New: UAS keeps resetting disks

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215333

            Bug ID: 215333
           Summary: UAS keeps resetting disks
           Product: IO/Storage
           Version: 2.5
    Kernel Version: Any
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: SCSI
          Assignee: linux-scsi@vger.kernel.org
          Reporter: d.bergloev@gmail.com
        Regression: No

Created attachment 300031
  --> https://bugzilla.kernel.org/attachment.cgi?id=300031&action=edit
UAS Log from boot

Hi. 

Not sure what the benefit of UAS should supposed to be, considering that is
never works, besides breaking things. I have had issues with this using
specific USB Disks with live installers in the past, and now I spent a whole
day debugging boot issues on two servers, caused by UAS on a specific USB/Sata
adapter. 

https://superuser.com/questions/1693125/boot-loop-with-certain-sata-to-usb-adaptors/1693143#1693143 

I have written in detail the issue in the above link along with other details
from various testing that I have done. But in general here is the problem. 

I had two different types of USB3/Sata adapters. One from Hama that seamed to
work and another from DeLock that would cause boot issues due to the fact that
UAS kept resetting the disks. I found that adding a quirks to usb-storage
module, would stop that adapter from being used by UAS and would make it work
properly. I also found that the Hama adapter was already pre-disabled within
the usb-storage module, which is why it worked out-of-box. But it also means
that neither of the adapters works with UAS. So if nothing works with this, but
rather just produces problems for people (There are a ton of these issues
across the web), why not remove it altogether. There may be some benefits from
UAS (When it works), but considering how much havoc it creates, is it worth it?

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