BUG: SCSI SYNCHRONIZE_CACHE on driver unload

[Mark Lord]

On module removal of a SCSI Low-Level Driver (LLD),
the mid-layer tries to do a SYNCHRONIZE_CACHE
command to each device on each host of that driver.

But the command is issued *after* setting SHOST_CANCEL,
which means that scsi_dispatch_cmd() will *always*
fail the command inline, without passing to the LLD.

This bug shows up only for hosts/drives which support
a write-back caching scheme.  For the more common
write-thru scheme, the SYNCHRONIZE_CACHE command is
never issued, so the bug never manifests.

Cheers
--
Mark Lord
(hdparm keeper & the original "Linux IDE Guy")
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