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From: Dmitry Chagin <dchagin@FreeBSD.org>
Date: Sat, 8 Jul 2017 21:08:22 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r320817 - head/sys/fs/fdescfs
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Author: dchagin
Date: Sat Jul  8 21:08:22 2017
New Revision: 320817
URL: https://svnweb.freebsd.org/changeset/base/320817

Log:
  Don't take a lock around atomic operation.
  
  MFC after:	3 weeks

Modified:
  head/sys/fs/fdescfs/fdesc_vfsops.c

Modified: head/sys/fs/fdescfs/fdesc_vfsops.c
==============================================================================
--- head/sys/fs/fdescfs/fdesc_vfsops.c	Sat Jul  8 21:05:28 2017	(r320816)
+++ head/sys/fs/fdescfs/fdesc_vfsops.c	Sat Jul  8 21:08:22 2017	(r320817)
@@ -123,7 +123,6 @@ static int
 fdesc_unmount(struct mount *mp, int mntflags)
 {
 	struct fdescmount *fmp;
-	caddr_t data;
 	int error, flags;
 
 	flags = 0;
@@ -148,15 +147,10 @@ fdesc_unmount(struct mount *mp, int mntflags)
 		return (error);
 
 	/*
-	 * Finally, throw away the fdescmount structure. Hold the hashmtx to
-	 * protect the fdescmount structure.
+	 * Finally, throw away the fdescmount structure.
 	 */
-	mtx_lock(&fdesc_hashmtx);
-	data = mp->mnt_data;
 	mp->mnt_data = NULL;
-	mtx_unlock(&fdesc_hashmtx);
-	free(data, M_FDESCMNT);	/* XXX */
-
+	free(fmp, M_FDESCMNT);
 	return (0);
 }