[PATCH] blacklist device don't use SYNCHRONIZE_CACHE

[Michael Clark <michael@metaparadigm.com>]

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Hi all,

With qla2300 loaded (and sdc a LUN on an external FC RAID controller),
I was getting a hang on reboot at:

   Synchronizing SCSI cache for disk sdc:

I did some debugging by changing the timeout in sd_sync_cache and
found the RAID Controller was just dropping the commands (it's an
external battery backed RAID array so the sd_sync_cache is not
important anyway).

So, attached patch adds to the SCSI blacklist infrastructure to
allow listing devices for which we shouldn't send a SYNCRONIZE_CACHE
command and adds in the misbehaving device i have here.

Now I can reboot ;) without waiting 7.5 minutes.

BTW - The default of 15 retries of 30 secs each is insane
(3 in sd_sync_cache x 5 in scsi_wait_req) - any real need
for the additional outer loop in sd_sync_cache ?

~mc


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