Attempt to get bounce_buffers working again for per-process kernel stack data targets.  At least st0 works for me again.... Also, scsi_scsi_cmd() looks like it's been exiting without a biodone() on an attached buffer in a number of error cases, leading to locked buffers.
Attempt to get bounce_buffers working again for per-process kernel stack
data targets.  At least st0 works for me again....
Also, scsi_scsi_cmd() looks like it's been exiting without a biodone() on
an attached buffer in a number of error cases, leading to locked buffers.

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