md: raid0: Make raid0_run() return a proper error code.

Currently raid0_run() always returns -ENOMEM on errors. This is
incorrect as running the array might fail for other reasons, for
example because not all component devices were available.

This patch changes create_strip_zones() so that it returns a proper
error code (either -ENOMEM or -EINVAL) rather than 1 on errors and
makes raid0_run(), its single caller, return that value instead
of -ENOMEM.
Signed-off-by: NAndre Noll <maan@systemlinux.org>
Signed-off-by: NNeilBrown <neilb@suse.de>

drivers/md/raid0.c

@@ -105,12 +105,12 @@ static int create_strip_zones (mddev_t *mddev)
 	conf->strip_zone = kzalloc(sizeof(struct strip_zone)*
 				conf->nr_strip_zones, GFP_KERNEL);
 	if (!conf->strip_zone)
-		return 1;
+		return -ENOMEM;
 	conf->devlist = kzalloc(sizeof(mdk_rdev_t*)*
 				conf->nr_strip_zones*mddev->raid_disks,
 				GFP_KERNEL);
 	if (!conf->devlist)
-		return 1;
+		return -ENOMEM;
 
 	/* The first zone must contain all devices, so here we check that
 	 * there is a proper alignment of slots to devices and find them all
@@ -207,8 +207,8 @@ static int create_strip_zones (mddev_t *mddev)
 
 	printk(KERN_INFO "raid0: done.\n");
 	return 0;
- abort:
-	return 1;
+abort:
+	return -EINVAL;
 }
 
 /**
@@ -254,6 +254,7 @@ static sector_t raid0_size(mddev_t *mddev, sector_t sectors, int raid_disks)
 static int raid0_run(mddev_t *mddev)
 {
 	raid0_conf_t *conf;
+	int ret;
 
 	if (mddev->chunk_size == 0) {
 		printk(KERN_ERR "md/raid0: non-zero chunk size required.\n");
@@ -269,12 +270,13 @@ static int raid0_run(mddev_t *mddev)
 
 	conf = kmalloc(sizeof (raid0_conf_t), GFP_KERNEL);
 	if (!conf)
-		goto out;
+		return -ENOMEM;
 	mddev->private = (void *)conf;
  
 	conf->strip_zone = NULL;
 	conf->devlist = NULL;
-	if (create_strip_zones (mddev)) 
+	ret = create_strip_zones(mddev);
+	if (ret < 0)
 		goto out_free_conf;
 
 	/* calculate array device size */
@@ -306,8 +308,7 @@ static int raid0_run(mddev_t *mddev)
 	kfree(conf->devlist);
 	kfree(conf);
 	mddev->private = NULL;
-out:
-	return -ENOMEM;
+	return ret;
 }
 
 static int raid0_stop (mddev_t *mddev)