[Bug 219362] New: USB SATA does not correctly shutdown the SSD upon poweroff causing data loss

[bugzilla-daemon@xxxxxxxxxx]

https://bugzilla.kernel.org/show_bug.cgi?id=219362

            Bug ID: 219362
           Summary: USB SATA does not correctly shutdown the SSD upon
                    poweroff causing data loss
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: USB
          Assignee: drivers_usb@xxxxxxxxxxxxxxxxxxxxxx
          Reporter: harviecz@xxxxxxxxx
        Regression: No

I have SATA SSD drive connected via TUSB9261 converter. Eventualy i experience
filesystem inconsistency when i repeatedly shutdown the device like this:

echo s > /proc/sysrq-trigger;
echo u > /proc/sysrq-trigger;
echo o > /proc/sysrq-trigger;

Same problem does not occur when i do this:

echo s > /proc/sysrq-trigger;
echo u > /proc/sysrq-trigger;
for i in /sys/block/*/device/delete; do echo 1 > "$i"; done;
echo o > /proc/sysrq-trigger;

This tells me, sysrq power(o)ff does not shutdown the devices in correct order.
It shuts down the USB hub before it sends SATA shutdown to the SSD, therefore
failing to notify SSD to write its internal caches before PMIC shuts down the
power completely.

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