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[SCSI] hpsa: do not attempt to read from a write-only register
authorStephen M. Cameron <scameron@beardog.cce.hp.com>
Thu, 21 Jul 2011 18:16:05 +0000 (13:16 -0500)
committerJames Bottomley <JBottomley@Parallels.com>
Wed, 27 Jul 2011 11:18:26 +0000 (15:18 +0400)
Most smartarrays tolerate it, but a few new ones don't.
Without this change some newer Smart Arrays will lock up
and i/o will grind to a halt.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Cc: stable@kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

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