From f281233d3eba15fb225d21ae2e228fd4553d824a Mon Sep 17 00:00:00 2001 From: Jeff Garzik Date: Tue, 16 Nov 2010 02:10:29 -0500 Subject: 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 Acked-by: James Bottomley Signed-off-by: Linus Torvalds --- drivers/scsi/aic7xxx/aic79xx_osm.c | 4 +++- drivers/scsi/aic7xxx/aic7xxx_osm.c | 4 +++- 2 files changed, 6 insertions(+), 2 deletions(-) (limited to 'drivers/scsi/aic7xxx') diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c index 88ad8482ef59..25d066624476 100644 --- a/drivers/scsi/aic7xxx/aic79xx_osm.c +++ b/drivers/scsi/aic7xxx/aic79xx_osm.c @@ -573,7 +573,7 @@ ahd_linux_info(struct Scsi_Host *host) * Queue an SCB to the controller. */ static int -ahd_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *)) +ahd_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *)) { struct ahd_softc *ahd; struct ahd_linux_device *dev = scsi_transport_device_data(cmd->device); @@ -588,6 +588,8 @@ ahd_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *)) return rtn; } +static DEF_SCSI_QCMD(ahd_linux_queue) + static struct scsi_target ** ahd_linux_target_in_softc(struct scsi_target *starget) { diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c index aeea7a61478e..4a359bb307c6 100644 --- a/drivers/scsi/aic7xxx/aic7xxx_osm.c +++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c @@ -528,7 +528,7 @@ ahc_linux_info(struct Scsi_Host *host) * Queue an SCB to the controller. */ static int -ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *)) +ahc_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *)) { struct ahc_softc *ahc; struct ahc_linux_device *dev = scsi_transport_device_data(cmd->device); @@ -548,6 +548,8 @@ ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *)) return rtn; } +static DEF_SCSI_QCMD(ahc_linux_queue) + static inline struct scsi_target ** ahc_linux_target_in_softc(struct scsi_target *starget) { -- cgit v1.2.3