2 files changed, 5 insertions, 0 deletions

diff --git a/sys/fs/devfs/devfs_devs.c b/sys/fs/devfs/devfs_devs.c
index 984ff2748441..cb79635595e0 100644
--- a/sys/fs/devfs/devfs_devs.c
+++ b/sys/fs/devfs/devfs_devs.c
@@ -138,6 +138,8 @@ devfs_alloc(int flags)
 	if (cdp == NULL)
 		return (NULL);
 
+	mtx_init(&cdp->cdp_threadlock, "devthrd", NULL, MTX_DEF);
+
 	cdp->cdp_dirents = &cdp->cdp_dirent0;
 
 	cdev = &cdp->cdp_c;
@@ -180,6 +182,7 @@ devfs_free(struct cdev *cdev)
 	devfs_free_cdp_inode(cdp->cdp_inode);
 	if (cdp->cdp_maxdirent > 0) 
 		free(cdp->cdp_dirents, M_DEVFS2);
+	mtx_destroy(&cdp->cdp_threadlock);
 	free(cdp, M_CDEVP);
 }
 
diff --git a/sys/fs/devfs/devfs_int.h b/sys/fs/devfs/devfs_int.h
index c5ed46ebc905..4b23e4fce272 100644
--- a/sys/fs/devfs/devfs_int.h
+++ b/sys/fs/devfs/devfs_int.h
@@ -70,6 +70,8 @@ struct cdev_priv {
 	void			*cdp_dtr_cb_arg;
 
 	LIST_HEAD(, cdev_privdata) cdp_fdpriv;
+
+	struct mtx		cdp_threadlock;
 };
 
 #define	cdev2priv(c)	__containerof(c, struct cdev_priv, cdp_c)