scsi: use class iteration api

Convert to use the class iteration api.

Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Cc: James Bottomley <James.Bottomley@hansenpartnership.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 13 insertions, 11 deletions

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 24271a871b8c..6325115e5b3d 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;
 }