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, 3 insertions, 1 deletions

diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
index cf89091e4c3d..5e76a624cb08 100644
--- a/drivers/scsi/pmcraid.c
+++ b/drivers/scsi/pmcraid.c
@@ -3478,7 +3478,7 @@ static int pmcraid_copy_sglist(
  *        SCSI_MLQUEUE_DEVICE_BUSY if device is busy
  *        SCSI_MLQUEUE_HOST_BUSY if host is busy
  */
-static int pmcraid_queuecommand(
+static int pmcraid_queuecommand_lck(
         struct scsi_cmnd *scsi_cmd,
         void (*done) (struct scsi_cmnd *)
 )
@@ -3584,6 +3584,8 @@ static int pmcraid_queuecommand(
         return rc;
 }
 
+static DEF_SCSI_QCMD(pmcraid_queuecommand)
+
 /**
  * pmcraid_open -char node "open" entry, allowed only users with admin access
  */