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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/aha1542.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/aha1542.h')
-rw-r--r--drivers/scsi/aha1542.h2
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 */
132}; 132};
133 133
134static int aha1542_detect(struct scsi_host_template *); 134static int aha1542_detect(struct scsi_host_template *);
135static int aha1542_queuecommand(Scsi_Cmnd *, void (*done)(Scsi_Cmnd *)); 135static int aha1542_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
136static int aha1542_bus_reset(Scsi_Cmnd * SCpnt); 136static int aha1542_bus_reset(Scsi_Cmnd * SCpnt);
137static int aha1542_dev_reset(Scsi_Cmnd * SCpnt); 137static int aha1542_dev_reset(Scsi_Cmnd * SCpnt);
138static int aha1542_host_reset(Scsi_Cmnd * SCpnt); 138static int aha1542_host_reset(Scsi_Cmnd * SCpnt);