commit d9bcb21179ccfea122f326aca4690afe0f7de0c6
Author: Mingming Cao <mmc@linux.vnet.ibm.com>
Date:   Mon Mar 1 21:34:34 2021 -0800

    hcnmgr: Wait for sysfs device ready when looking up device name
    
    At the time of calling ofpathname to look up for devicename, wait
    for sysfs device ready. Otherwise, the OS may be in the middle of device
    renaming.
    
    Signed-off-by: Mingming Cao <mmc@linux.vnet.ibm.com>
    [tyreld: fixed up commit log]
    Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>

diff --git a/scripts/hcnmgr b/scripts/hcnmgr
index c95edba..0d20e7d 100644
--- a/scripts/hcnmgr
+++ b/scripts/hcnmgr
@@ -241,7 +241,10 @@ get_dev_hcn() {
 	# Let's retry a few times.
 	while [ $wait != 0 ]; do
 		if DEVNAME=$(ofpathname -l "$(echo "$1" | sed -e "s/\/proc\/device-tree//")" 2>/dev/null); then
-			break
+			if [ -e /sys/class/net/"$DEVNAME" ]; then
+				hcnlog DEBUG "ofpathname waiting for /sys/class/net device $DEVNAME ready"
+				break
+			fi
 		fi
 
 		hcnlog DEBUG "ofpathname return $?, devname is $DEVNAME rety counter $wait"