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authorJeff Garzik <jeff@garzik.org>2010-11-16 02:10:29 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2010-11-16 16:33:23 -0500
commitf281233d3eba15fb225d21ae2e228fd4553d824a (patch)
tree51134454ba8acb558735f90be5540f7d756483e3 /drivers/scsi/sun3_scsi.h
parentbdbd01ac444bffb3c9aefed3059d12554059b320 (diff)
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>
Diffstat (limited to 'drivers/scsi/sun3_scsi.h')
-rw-r--r--drivers/scsi/sun3_scsi.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/scsi/sun3_scsi.h b/drivers/scsi/sun3_scsi.h
index b29a9d661ca4..bcefd8458e65 100644
--- a/drivers/scsi/sun3_scsi.h
+++ b/drivers/scsi/sun3_scsi.h
@@ -51,8 +51,7 @@ static int sun3scsi_abort(struct scsi_cmnd *);
51static int sun3scsi_detect (struct scsi_host_template *); 51static int sun3scsi_detect (struct scsi_host_template *);
52static const char *sun3scsi_info (struct Scsi_Host *); 52static const char *sun3scsi_info (struct Scsi_Host *);
53static int sun3scsi_bus_reset(struct scsi_cmnd *); 53static int sun3scsi_bus_reset(struct scsi_cmnd *);
54static int sun3scsi_queue_command(struct scsi_cmnd *, 54static int sun3scsi_queue_command(struct Scsi_Host *, struct scsi_cmnd *);
55 void (*done)(struct scsi_cmnd *));
56static int sun3scsi_release (struct Scsi_Host *); 55static int sun3scsi_release (struct Scsi_Host *);
57 56
58#ifndef CMD_PER_LUN 57#ifndef CMD_PER_LUN