linux/drivers/scsi/megaraid
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.megaraid [SCSI] megaraid_{mbox,mm} : remove PCI Id overlaping between megaraid_legacy and megaraid_{mbox,mm} 2005-12-13 18:10:56 -07:00
Makefile [SCSI] MegaRAID SAS RAID: new driver 2005-09-26 17:32:44 -05:00
mbox_defs.h tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
mega_common.h [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
megaraid_ioctl.h Convert asm/semaphore.h users to linux/semaphore.h 2008-04-18 22:22:54 -04:00
megaraid_mbox.c SCSI host lock push-down 2010-11-16 13:33:23 -08:00
megaraid_mbox.h [SCSI] megaraid_mbox: fix Dell CERC firmware problem 2008-04-29 19:34:07 -05:00
megaraid_mm.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
megaraid_mm.h [SCSI] MegaRAID driver management char device moved to misc 2008-02-11 10:20:53 -06:00
megaraid_sas.c SCSI host lock push-down 2010-11-16 13:33:23 -08:00
megaraid_sas.h [SCSI] megaraid_sas: Version and documentation update 2010-10-26 11:11:12 -05:00