linux-kernel - [RFC v4 09/19] libata: Remove host_lock unlock() + lock() from ata_scsi

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Date:	Mon, 27 Sep 2010 19:06:41 -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 09/19] libata: Remove host_lock unlock() + lock() from ata_scsi_queuecmd()

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

This patch removes the now legacy host_lock unlock() + lock() optimization
from libata-scsi.c:ata_scsi_queuecmd().  This also includes setting the
of SHT->unlocked_qcmd=1 for libata ata_scsi_queuecmd().

Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
 drivers/ata/libata-scsi.c |    4 +---
 include/linux/libata.h    |    1 +
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index a89172c..acb6669 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3161,7 +3161,7 @@ static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
  *	ATA and ATAPI devices appearing as SCSI devices.
  *
  *	LOCKING:
- *	Releases scsi-layer-held lock, and obtains host lock.
+ *	None
  *
  *	RETURNS:
  *	Return value from __ata_scsi_queuecmd() if @cmd can be queued,
@@ -3177,7 +3177,6 @@ int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
 
 	ap = ata_shost_to_port(shost);
 
-	spin_unlock(shost->host_lock);
 	spin_lock(ap->lock);
 
 	ata_scsi_dump_cdb(ap, cmd);
@@ -3191,7 +3190,6 @@ int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
 	}
 
 	spin_unlock(ap->lock);
-	spin_lock(shost->host_lock);
 	return rc;
 }
 
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 45fb296..c08a0b9 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1171,6 +1171,7 @@ extern struct device_attribute *ata_common_sdev_attrs[];
 	.queuecommand		= ata_scsi_queuecmd,		\
 	.can_queue		= ATA_DEF_QUEUE,		\
 	.this_id		= ATA_SHT_THIS_ID,		\
+	.unlocked_qcmd		= 1,				\
 	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,		\
 	.emulated		= ATA_SHT_EMULATED,		\
 	.use_clustering		= ATA_SHT_USE_CLUSTERING,	\
-- 
1.7.3

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