PATCH - md 1 of 3 - Don't lock array for START_ARRAY

[Neil Brown <neilb@cse.unsw.edu.au>]

Well, it looks like that bit patch bomb wasn't quite perfect..

Here are three more, against 2.5.23, that address:
 - "raidstart" would hang
 - compiler warning
 - compile failure when not SMP.

NeilBrown

###Comments for ChangeSet

... as autostart_array does it's own locking.


 ----------- Diffstat output ------------
 ./drivers/md/md.c |   26 ++++++++++++++------------
 1 files changed, 14 insertions(+), 12 deletions(-)

--- ./drivers/md/md.c	2002/06/19 04:28:22	1.1
+++ ./drivers/md/md.c	2002/06/19 23:20:56	1.2
@@ -2546,6 +2546,20 @@
 		goto abort;
 	}
 
+
+	if (cmd == START_ARRAY) {
+		/* START_ARRAY doesn't need to lock the array as autostart_array
+		 * does the locking, and it could even be a different array
+		 */
+		err = autostart_array(val_to_kdev(arg));
+		if (err) {
+			printk(KERN_WARNING "md: autostart %s failed!\n",
+			       partition_name(val_to_kdev(arg)));
+			goto abort;
+		}
+		goto done;
+	}
+
 	err = mddev_lock(mddev);
 	if (err) {
 		printk(KERN_INFO "md: ioctl lock interrupted, reason %d, cmd %d\n",
@@ -2580,18 +2594,6 @@
 					printk(KERN_WARNING "md: couldnt set array info. %d\n", err);
 					goto abort_unlock;
 				}
-			}
-			goto done_unlock;
-
-		case START_ARRAY:
-			/*
-			 * possibly make it lock the array ...
-			 */
-			err = autostart_array(val_to_kdev(arg));
-			if (err) {
-				printk(KERN_WARNING "md: autostart %s failed!\n",
-					partition_name(val_to_kdev(arg)));
-				goto abort_unlock;
 			}
 			goto done_unlock;