1 files changed, 8 insertions, 11 deletions

diff --git a/scripts/runqemu b/scripts/runqemu
index 50224f2784..ef24ddc6b2 100755
--- a/scripts/runqemu
+++ b/scripts/runqemu
@@ -1011,17 +1011,14 @@ to your build configuration.
             else:
                 self.nfs_server = '192.168.7.@GATEWAY@'
 
-        # Figure out a new nfs_instance to allow multiple qemus running.
-        ps = subprocess.check_output(("ps", "auxww")).decode('utf-8')
-        pattern = '/bin/unfsd .* -i .*\.pid -e .*/exports([0-9]+) '
-        all_instances = re.findall(pattern, ps, re.M)
-        if all_instances:
-            all_instances.sort(key=int)
-            self.nfs_instance = int(all_instances.pop()) + 1
-
-        nfsd_port = 3049 + 2 * self.nfs_instance
-        mountd_port = 3048 + 2 * self.nfs_instance
+        nfsd_port = 3048 + self.nfs_instance
+        lockdir = "/tmp/qemu-port-locks"
+        self.make_lock_dir(lockdir)
+        while not self.check_free_port('localhost', nfsd_port, lockdir):
+            self.nfs_instance += 1
+            nfsd_port += 1
 
+        mountd_port = nfsd_port
         # Export vars for runqemu-export-rootfs
         export_dict = {
             'NFS_INSTANCE': self.nfs_instance,
@@ -1595,13 +1592,13 @@ to your build configuration.
             logger.debug('Running %s' % str(cmd))
             subprocess.check_call(cmd)
         self.release_taplock()
-        self.release_portlock()
 
         if self.nfs_running:
             logger.info("Shutting down the userspace NFS server...")
             cmd = ("runqemu-export-rootfs", "stop", self.rootfs)
             logger.debug('Running %s' % str(cmd))
             subprocess.check_call(cmd)
+        self.release_portlock()
 
         if self.saved_stty:
             subprocess.check_call(("stty", self.saved_stty))