[PATCH 2.6.19-rc1 1/3] ieee1394: lock smaller region by host_num_alloc mutex

[Stefan Richter <stefanr@s5r6.in-berlin.de>]

We need the mutex only around the iteration over existing hosts.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
This prepares hosts.c for the following patch which adds checks of
driver core errors.

Index: linux-2.6.19-rc1/drivers/ieee1394/hosts.c
===================================================================
--- linux-2.6.19-rc1.orig/drivers/ieee1394/hosts.c	2006-10-10 19:06:06.000000000 +0200
+++ linux-2.6.19-rc1/drivers/ieee1394/hosts.c	2006-10-10 19:07:36.000000000 +0200
@@ -156,10 +156,9 @@ struct hpsb_host *hpsb_alloc_host(struct
 	h->speed_map = (u8 *)(h->csr.speed_map + 2);
 
 	mutex_lock(&host_num_alloc);
-
 	while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb))
 		hostnum++;
-
+	mutex_unlock(&host_num_alloc);
 	h->id = hostnum;
 
 	memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device));
@@ -174,8 +173,6 @@ struct hpsb_host *hpsb_alloc_host(struct
 	class_device_register(&h->class_dev);
 	get_device(&h->device);
 
-	mutex_unlock(&host_num_alloc);
-
 	return h;
 }