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/g_NCR5380.h b/drivers/scsi/g_NCR5380.h
index 921764c..1bcdb7b 100644
--- a/drivers/scsi/g_NCR5380.h
+++ b/drivers/scsi/g_NCR5380.h
@@ -46,7 +46,7 @@
 static int generic_NCR5380_abort(Scsi_Cmnd *);
 static int generic_NCR5380_detect(struct scsi_host_template *);
 static int generic_NCR5380_release_resources(struct Scsi_Host *);
-static int generic_NCR5380_queue_command(Scsi_Cmnd *, void (*done)(Scsi_Cmnd *));
+static int generic_NCR5380_queue_command(struct Scsi_Host *, struct scsi_cmnd *);
 static int generic_NCR5380_bus_reset(Scsi_Cmnd *);
 static const char* generic_NCR5380_info(struct Scsi_Host *);