linux-kernel - [PATCH 191/196] scsi: use class iteration api

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Date:	Thu, 24 Jan 2008 23:33:40 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Dave Young <hidave.darkstar@...il.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 191/196] scsi: use class iteration api

From: Dave Young <hidave.darkstar@...il.com>

Convert to use the class iteration api.

Signed-off-by: Dave Young <hidave.darkstar@...il.com>
Cc: James Bottomley <James.Bottomley@...senpartnership.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/scsi/hosts.c |   24 +++++++++++++-----------
 1 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 24271a8..6325115 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -429,6 +429,15 @@ void scsi_unregister(struct Scsi_Host *shost)
 }
 EXPORT_SYMBOL(scsi_unregister);
 
+static int __scsi_host_match(struct class_device *cdev, void *data)
+{
+	struct Scsi_Host *p;
+	unsigned short *hostnum = (unsigned short *)data;
+
+	p = class_to_shost(cdev);
+	return p->host_no == *hostnum;
+}
+
 /**
  * scsi_host_lookup - get a reference to a Scsi_Host by host no
  *
@@ -439,19 +448,12 @@ EXPORT_SYMBOL(scsi_unregister);
  **/
 struct Scsi_Host *scsi_host_lookup(unsigned short hostnum)
 {
-	struct class *class = &shost_class;
 	struct class_device *cdev;
-	struct Scsi_Host *shost = ERR_PTR(-ENXIO), *p;
+	struct Scsi_Host *shost = ERR_PTR(-ENXIO);
 
-	down(&class->sem);
-	list_for_each_entry(cdev, &class->children, node) {
-		p = class_to_shost(cdev);
-		if (p->host_no == hostnum) {
-			shost = scsi_host_get(p);
-			break;
-		}
-	}
-	up(&class->sem);
+	cdev = class_find_child(&shost_class, &hostnum, __scsi_host_match);
+	if (cdev)
+		shost = scsi_host_get(class_to_shost(cdev));
 
 	return shost;
 }
-- 
1.5.3.8

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