From: NeilBrown <neilb@suse.de>
Subject: allow array to be stopped using kernel name
References: bnc#821861
Upstream: v3.3

e.g.
   mdadm -S md6

Can be useful of udev is confused or dead.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 Manage.c |    6 +++++-
 mdadm.c  |   15 ++++++++++++++-
 2 files changed, 19 insertions(+), 2 deletions(-)

--- mdadm-3.2.2.orig/Manage.c
+++ mdadm-3.2.2/Manage.c
@@ -218,7 +218,11 @@ int Manage_runstop(char *devname, int fd
 		 * to stop is probably a bad idea.
 		 */
 		close(fd);
-		fd = open(devname, O_RDONLY|O_EXCL);
+		if (devname[0] == '/')
+			fd = open(devname, O_RDONLY|O_EXCL);
+		else
+			fd = open_dev_flags(devname2devnum(devname),
+					    O_RDONLY|O_EXCL);
 		if (fd < 0 || fd2devnum(fd) != devnum) {
 			if (fd >= 0)
 				close(fd);
--- mdadm-3.2.2.orig/mdadm.c
+++ mdadm-3.2.2/mdadm.c
@@ -1602,7 +1602,20 @@ int main(int argc, char *argv[])
 					rv |= Update_subarray(dv->devname, subarray, update, &ident, quiet);
 					continue;
 				}
-				mdfd = open_mddev(dv->devname, 1);
+				if (dv->devname[0] == '/')
+					mdfd = open_mddev(dv->devname, 1);
+				else if (strncmp(dv->devname, "md", 2)==0) {
+					mdfd = open_dev_flags(devname2devnum(dv->devname),
+							      O_RDONLY);
+					if (mdfd < 0)
+						fprintf(stderr, Name ": cannot open %s\n",
+							dv->devname);
+				} else {
+					mdfd = -1;
+					fprintf(stderr, Name ": %s is not a valid md device name.\n",
+						dv->devname);
+				}
+
 				if (mdfd>=0) {
 					switch(dv->disposition) {
 					case 'R':