linux/drivers/scsi/libsas
Jeff Garzik f281233d3e 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>
2010-11-16 13:33:23 -08:00
..
Kconfig
Makefile
sas_ata.c [SCSI] libsas: Don't issue commands to devices that have been hot-removed 2010-10-08 16:03:42 -05:00
sas_discover.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
sas_dump.c [SCSI] struct device - replace bus_id with dev_name(), dev_set_name() 2009-01-02 10:22:16 -06:00
sas_dump.h
sas_event.c
sas_expander.c [SCSI] libsas: fix bug for vacant phy 2010-10-11 17:40:00 -05:00
sas_host_smp.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
sas_init.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
sas_internal.h block: unify request timeout handling 2008-10-09 08:56:13 +02:00
sas_phy.c
sas_port.c [SCSI] libsas: reuse the original port when hotplugging phys in wide ports 2009-07-16 12:50:44 -05:00
sas_scsi_host.c SCSI host lock push-down 2010-11-16 13:33:23 -08:00
sas_task.c [SCSI] Unify SAM_ and SAM_STAT_ macros 2010-07-28 09:07:49 -05:00