linux-kernel - [RFC v4 12/19] qla2xxx: Remove host_lock unlock() + lock() from qla2xxx

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Message-Id: <1285639632-7445-1-git-send-email-nab@linux-iscsi.org>
Date:	Mon, 27 Sep 2010 19:07:12 -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 12/19] qla2xxx: Remove host_lock unlock() + lock() from qla2xxx_queuecommand()

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

This patch removes the now legacy host_lock unlock() + lock() optimization
from qla_os.c:qla2xxx_queuecommand().  This also includes setting the
SHT->unlocked_qcmd=1 for host_lock less qla2xxx qla2xxx_queuecommand operation.

Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
 drivers/scsi/qla2xxx/qla_os.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 1e4bff6..5654f1b 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -204,6 +204,7 @@ struct scsi_host_template qla2xxx_driver_template = {
 	.scan_start		= qla2xxx_scan_start,
 	.change_queue_depth	= qla2x00_change_queue_depth,
 	.change_queue_type	= qla2x00_change_queue_type,
+	.unlocked_qcmd		= 1,
 	.this_id		= -1,
 	.cmd_per_lun		= 3,
 	.use_clustering		= ENABLE_CLUSTERING,
@@ -574,11 +575,9 @@ qla2xxx_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
 		goto qc24_target_busy;
 	}
 
-	spin_unlock_irq(vha->host->host_lock);
-
 	sp = qla2x00_get_new_sp(base_vha, fcport, cmd, done);
 	if (!sp)
-		goto qc24_host_busy_lock;
+		goto qc24_host_busy;
 
 	rval = ha->isp_ops->start_scsi(sp);
 	if (rval != QLA_SUCCESS)
@@ -592,8 +591,7 @@ qc24_host_busy_free_sp:
 	qla2x00_sp_free_dma(sp);
 	mempool_free(sp, ha->srb_mempool);
 
-qc24_host_busy_lock:
-	spin_lock_irq(vha->host->host_lock);
+qc24_host_busy:
 	return SCSI_MLQUEUE_HOST_BUSY;
 
 qc24_target_busy:
-- 
1.7.3

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