linux-kernel - [PATCH 1/8] scsi: Drop struct Scsi_Host->host

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Message-Id: <1284676529-10756-1-git-send-email-nab@linux-iscsi.org>
Date:	Thu, 16 Sep 2010 15:35:29 -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>
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>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 1/8] scsi: Drop struct Scsi_Host->host_lock around SHT->queuecommand()

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

This patch converts scsi_dispatch_cmd() to only hold struct Scsi_Host->host_lock
for scsi_cmd_get_serial(), and drops the lock because the call into
the LLD with host->hostt->queuecommand().

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

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index ad0ed21..06e5b3a 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -745,6 +745,7 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
 	 * TODO: kill serial or move to blk layer
 	 */
 	scsi_cmd_get_serial(host, cmd); 
+	spin_unlock_irqrestore(host->host_lock, flags);
 
 	if (unlikely(host->shost_state == SHOST_DEL)) {
 		cmd->result = (DID_NO_CONNECT << 16);
@@ -753,7 +754,7 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
 		trace_scsi_dispatch_cmd_start(cmd);
 		rtn = host->hostt->queuecommand(cmd, scsi_done);
 	}
-	spin_unlock_irqrestore(host->host_lock, flags);
+
 	if (rtn) {
 		trace_scsi_dispatch_cmd_error(cmd, rtn);
 		if (rtn != SCSI_MLQUEUE_DEVICE_BUSY &&
-- 
1.7.2.3

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