linux-kernel - [RFC v4 05/19] mvsas: Set SHT->unlocked

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Message-Id: <1285639550-7304-1-git-send-email-nab@linux-iscsi.org>
Date:	Mon, 27 Sep 2010 19:05:50 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Vasu Dev <vasu.dev@...ux.intel.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	James Bottomley <James.Bottomley@...e.de>,
	Mike Christie <michaelc@...wisc.edu>,
	Jens Axboe <jaxboe@...ionio.com>
Cc:	James Smart <james.smart@...lex.com>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Hannes Reinecke <hare@...e.de>,
	Joe Eykholt <jeykholt@...co.com>,
	Christoph Hellwig <hch@....de>,
	Jon Hawley <warthog9@...nel.org>,
	MPTFusionLinux <DL-MPTFusionLinux@....com>,
	"eata.c maintainer" <dario.ballabio@...ind.it>,
	Luben Tuikov <ltuikov@...oo.com>,
	mvsas maintainer <kewei@...vell.com>,
	pm8001 maintainer Jack Wang <jack_wang@...sh.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [RFC v4 05/19] mvsas: Set SHT->unlocked_qcmd=1 for libsas queuecommand()

From: Nicholas Bellinger <nab@...ux-iscsi.org>

This patch updates mvsas to set struct scsi_host_template->unlocked_qcmd=1
because it is using generic libsas sas_queuecommand() code which now can be
run without struct Scsi_Host->host_lock held following the original
host_lock unlock -> do_work() -> lock optimization in sas_queuecommand().

Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
 drivers/scsi/mvsas/mv_init.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/mvsas/mv_init.c b/drivers/scsi/mvsas/mv_init.c
index 19ad34f..7a83e07 100644
--- a/drivers/scsi/mvsas/mv_init.c
+++ b/drivers/scsi/mvsas/mv_init.c
@@ -54,6 +54,7 @@ static struct scsi_host_template mvs_sht = {
 	.can_queue		= 1,
 	.cmd_per_lun		= 1,
 	.this_id		= -1,
+	.unlocked_qcmd		= 1,
 	.sg_tablesize		= SG_MX,
 	.max_sectors		= SCSI_DEFAULT_MAX_SECTORS,
 	.use_clustering		= ENABLE_CLUSTERING,
-- 
1.7.3

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