linux-kernel - [PATCH 07/12] qla2xxx: Convert to host_lock less w/ interrupts disabled externally

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Date:	Sun, 19 Dec 2010 13:22:02 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...e.de>,
	Jeff Garzik <jeff@...zik.org>, Christoph Hellwig <hch@....de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Hannes Reinecke <hare@...e.de>,
	Mike Christie <michaelc@...wisc.edu>
Cc:	Mike Anderson <andmike@...ux.vnet.ibm.com>,
	Tejun Heo <tj@...nel.org>, Vasu Dev <vasu.dev@...ux.intel.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Ravi Anand <ravi.anand@...gic.com>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	Joe Eykholt <jeykholt@...co.com>,
	James Smart <james.smart@...lex.com>,
	Douglas Gilbert <dgilbert@...erlog.com>,
	adam radford <aradford@...il.com>,
	Kashyap Desai <Kashyap.Desai@....com>,
	MPTFusionLinux <DL-MPTFusionLinux@....com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 07/12] qla2xxx: Convert to host_lock less w/ interrupts disabled externally

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

This patch converts qla2xxx to run in host_lock less mode with the new
IRQ_DISABLE_SCSI_QCMD() that disables interrupts while calling ->queuecommand()
dispatch.  It also drops the legacy host_lock unlock optimization.

Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
 drivers/scsi/qla2xxx/qla_os.c |   11 +++--------
 1 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 2c0876c..c6cdfeb 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -534,7 +534,8 @@ qla2x00_get_new_sp(scsi_qla_host_t *vha, fc_port_t *fcport,
 }
 
 static int
-qla2xxx_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
+qla2xxx_queuecommand_irq_disable(struct scsi_cmnd *cmd,
+				void (*done)(struct scsi_cmnd *))
 {
 	scsi_qla_host_t *vha = shost_priv(cmd->device->host);
 	fc_port_t *fcport = (struct fc_port *) cmd->device->hostdata;
@@ -544,7 +545,6 @@ qla2xxx_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)
 	srb_t *sp;
 	int rval;
 
-	spin_unlock_irq(vha->host->host_lock);
 	if (ha->flags.eeh_busy) {
 		if (ha->flags.pci_channel_io_perm_failure)
 			cmd->result = DID_NO_CONNECT << 16;
@@ -585,8 +585,6 @@ qla2xxx_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)
 	if (rval != QLA_SUCCESS)
 		goto qc24_host_busy_free_sp;
 
-	spin_lock_irq(vha->host->host_lock);
-
 	return 0;
 
 qc24_host_busy_free_sp:
@@ -594,21 +592,18 @@ qc24_host_busy_free_sp:
 	mempool_free(sp, ha->srb_mempool);
 
 qc24_host_busy_lock:
-	spin_lock_irq(vha->host->host_lock);
 	return SCSI_MLQUEUE_HOST_BUSY;
 
 qc24_target_busy:
-	spin_lock_irq(vha->host->host_lock);
 	return SCSI_MLQUEUE_TARGET_BUSY;
 
 qc24_fail_command:
-	spin_lock_irq(vha->host->host_lock);
 	done(cmd);
 
 	return 0;
 }
 
-static DEF_SCSI_QCMD(qla2xxx_queuecommand)
+static IRQ_DISABLE_SCSI_QCMD(qla2xxx_queuecommand)
 
 
 /*
-- 
1.7.3.4

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