conditionally remove map_dev from find_free_devnum

map_dev can be slow so it is best to not call it when
not necessary.
The final test in "find_free_devnum" is not relevant when
udev is being used, so remove the test in that case.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 1 insertions, 2 deletions

diff --git a/mdopen.c b/mdopen.c
index 24188df..462743c 100644
--- a/mdopen.c
+++ b/mdopen.c
@@ -330,8 +330,7 @@ int create_mddev(char *dev, char *name, int autof, int trustworthy,
 	 * If we cannot detect udev, we need to make
 	 * devices and links ourselves.
 	 */
-	if ((stat("/dev/.udev", &stb) != 0 && stat("/run/udev", &stb) != 0) ||
-	    check_env("MDADM_NO_UDEV")) {
+	if (!use_udev()) {
 		/* Make sure 'devname' exists and 'chosen' is a symlink to it */
 		if (lstat(devname, &stb) == 0) {
 			/* Must be the correct device, else error */