[Bug 151631] "Synchronizing SCSI cache" fails during(and delays) reboot/shutdown

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https://bugzilla.kernel.org/show_bug.cgi?id=151631

icanrealizeum <icanrealizeum+bugzillakernelorg@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Regression|No                          |Yes

--- Comment #4 from icanrealizeum <icanrealizeum+bugzillakernelorg@gmail.com> ---
I have worked around this issue(for me) by adding a few lines in debug.sh like:

if test "$1" == "poweroff"; then
 hdparm -Y /dev/sda
 echo o > /proc/sysrq-trigger ; sleep 5
fi

that puts drive to sleep and triggers shutdown via sysrq

Seems to have worked just fine: no drive issues on startup anymore, as I've
mentioned before with having to ctrl+alt+del once to get BIOS to detect drive;
and no extra delays.

Also the above require a kernel patch:
//sd_start_stop_device(sdkp, 0);
commenting out that call in sd_shutdown function in file: drivers/scsi/sd.c
or else it will fail like in comment #3

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