linux/drivers/scsi/libfc
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
..
fc_disc.c [SCSI] libfc: Do not let disc work cancel itself 2010-10-25 15:11:37 -05:00
fc_elsct.c [SCSI] libfc: add fc_fill_reply_hdr() and fc_fill_hdr() 2010-07-28 09:06:00 -05:00
fc_exch.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2010-08-04 15:31:02 -07:00
fc_fcp.c SCSI host lock push-down 2010-11-16 13:33:23 -08:00
fc_frame.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
fc_libfc.c [SCSI] libfc: add fc_fill_reply_hdr() and fc_fill_hdr() 2010-07-28 09:06:00 -05:00
fc_libfc.h [SCSI] libfc: add discovery-private pointer for LLD 2010-07-28 09:05:52 -05:00
fc_lport.c [SCSI] libfc: adds flogi retry in case DID is zero in RJT 2010-10-25 15:11:32 -05:00
fc_npiv.c [SCSI] libfc: Move the port_id into lport 2010-05-16 22:22:34 -04:00
fc_rport.c [SCSI] libfc: fix setting of rport dev loss 2010-10-25 15:11:29 -05:00
Makefile [SCSI] libfc: add some generic NPIV support routines to libfc 2009-12-04 12:00:56 -06:00