1 files changed, 60 insertions, 0 deletions
diff --git a/debian/patches/fixes0004-Avoid-superfluous-locking-of-node.patch b/debian/patches/fixes0004-Avoid-superfluous-locking-of-node.patch
new file mode 100644
index 00000000..db4187ed
--- /dev/null
+++ b/debian/patches/fixes0004-Avoid-superfluous-locking-of-node.patch
@@ -0,0 +1,60 @@
+From 14647f8d3daeb5e18d77b40fd1d0c48e034903b5 Mon Sep 17 00:00:00 2001
+From: Justus Winter <justus@gnupg.org>
+Date: Mon, 25 Apr 2016 00:54:08 +0200
+Subject: [PATCH hurd 4/5] Avoid superfluous locking of node
+
+* libdiskfs/io-restrict-auth.c (diskfs_S_io_restrict_auth): Do not
+lock the associated node.  No operation here needs synchronization.
+* libnetfs/io-restrict-auth.c (netfs_S_io_restrict_auth): Likewise.
+---
+ libdiskfs/io-restrict-auth.c | 2 --
+ libnetfs/io-restrict-auth.c  | 3 ---
+ 2 files changed, 5 deletions(-)
+
+diff --git a/libdiskfs/io-restrict-auth.c b/libdiskfs/io-restrict-auth.c
+index 80c0b20..1c2c999 100644
+--- a/libdiskfs/io-restrict-auth.c
++++ b/libdiskfs/io-restrict-auth.c
+@@ -40,7 +40,6 @@ diskfs_S_io_restrict_auth (struct protid *cred,
+   if (err)
+     return err;
+ 
+-  pthread_mutex_lock (&cred->po->np->lock);
+   refcount_ref (&cred->po->refcnt);
+   err = diskfs_create_protid (cred->po, user, &newpi);
+   if (! err)
+@@ -51,7 +50,6 @@ diskfs_S_io_restrict_auth (struct protid *cred,
+     }
+   else
+     refcount_deref (&cred->po->refcnt);
+-  pthread_mutex_unlock (&cred->po->np->lock);
+ 
+   iohelp_free_iouser (user);
+   return err;
+diff --git a/libnetfs/io-restrict-auth.c b/libnetfs/io-restrict-auth.c
+index 79b7d09..89df671 100644
+--- a/libnetfs/io-restrict-auth.c
++++ b/libnetfs/io-restrict-auth.c
+@@ -42,19 +42,16 @@ netfs_S_io_restrict_auth (struct protid *user,
+   if (err)
+     return err;
+ 
+-  pthread_mutex_lock (&user->po->np->lock);
+   refcount_ref (&user->po->refcnt);
+   newpi = netfs_make_protid (user->po, new_user);
+   if (newpi)
+     {
+       *newport = ports_get_right (newpi);
+-      pthread_mutex_unlock (&user->po->np->lock);
+       *newporttype = MACH_MSG_TYPE_MAKE_SEND;
+     }
+   else
+     {
+       refcount_deref (&user->po->refcnt);
+-      pthread_mutex_unlock (&user->po->np->lock);
+       iohelp_free_iouser (new_user);
+       err = ENOMEM;
+     }
+-- 
+2.1.4
+