[SCSI] ibmvscsi: treat busy and error conditions separately
This patch fixes a condition where ibmvscsi treats a transport error as a
"busy" condition, so no errors were returned to the scsi mid-layer.
In a RAID environment this means that I/O hung rather than failing
over.
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>
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