SCSI host lock push-down

Move the mid-layer's ->queuecommand() invocation from being locked
with the host lock to being unlocked to facilitate speeding up the
critical path for drivers who don't need this lock taken anyway.

The patch below presents a simple SCSI host lock push-down as an
equivalent transformation.  No locking or other behavior should change
with this patch.  All existing bugs and locking orders are preserved.

Additionally, add one parameter to queuecommand,
	struct Scsi_Host *
and remove one parameter from queuecommand,
	void (*done)(struct scsi_cmnd *)

Scsi_Host* is a convenient pointer that most host drivers need anyway,
and 'done' is redundant to struct scsi_cmnd->scsi_done.

Minimal code disturbance was attempted with this change.  Most drivers
needed only two one-line modifications for their host lock push-down.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Acked-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/scsi/aha1542.h b/drivers/scsi/aha1542.h
index 1db538552d56..b871d2b57f93 100644
--- a/drivers/scsi/aha1542.h
+++ b/drivers/scsi/aha1542.h
@@ -132,7 +132,7 @@ struct ccb {			/* Command Control Block 5.3 */
 };
 
 static int aha1542_detect(struct scsi_host_template *);
-static int aha1542_queuecommand(Scsi_Cmnd *, void (*done)(Scsi_Cmnd *));
+static int aha1542_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
 static int aha1542_bus_reset(Scsi_Cmnd * SCpnt);
 static int aha1542_dev_reset(Scsi_Cmnd * SCpnt);
 static int aha1542_host_reset(Scsi_Cmnd * SCpnt);