[Bug 220491] New: usb_storage connected SD card disconnects/reconnects on resume from suspend

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220491

            Bug ID: 220491
           Summary: usb_storage connected SD card disconnects/reconnects
                    on resume from suspend
           Product: Drivers
           Version: 2.5
          Hardware: Intel
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: paula@alumni.cse.ucsc.edu
        Regression: No

Created attachment 308549
  --> https://bugzilla.kernel.org/attachment.cgi?id=308549&action=edit
This is machine specific to a Samsung Ativ9 laptop, Intel Broadwell platform

I've had this Samsung laptop since 2015, 2560x1600 display, Intel Broadwell
platform, battery still has > 5 hour useful life. This is one of two machine
specific suspend/resume related problems that I would really like to patch if
possible. If the laptop is suspended for a while, the mounted usb connected SD
card is unmounted on resume. This results from the associated usb_storage
device disconnecting and reconnecting. I've looked at the so-called usb_persist
feature and the problem is "hard" enough that the persist feature won't paste
over it. I've attached a dmesg log with xhci_hcd dynamic debug enabled. The
debug messages are opaque enough that I thought I'd post here on the hope that
someone more experienced would weigh in. I am willing to do work but it would
be more efficient if I didn't have to discover too much arcana. For instance,
the xhci_hcd dynamic debug information doesn't shed much immediate light on why
the usb disconnect is happening. I mean there's a lot of xhci logging leading
up to the disconnect but it's not immediately clear why the disconnect happens
exactly when it happens. Of course, any help would be greatly appreciated.

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