Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6

* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
  SUNRPC: Fix use of static variable in rpcb_getport_async
  NFSv4.1: update nfs4_fattr_bitmap_maxsz
  SUNRPC: Fix a race between work-queue and rpc_killall_tasks
  pnfs: write: Set mds_offset in the generic layer - it is needed by all LDs

2 files changed, 12 insertions, 17 deletions

diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c
index 9a80a922c527..e45d2fbbe5a8 100644
--- a/net/sunrpc/rpcb_clnt.c
+++ b/net/sunrpc/rpcb_clnt.c
@@ -597,7 +597,7 @@ void rpcb_getport_async(struct rpc_task *task)
         u32 bind_version;
         struct rpc_xprt *xprt;
         struct rpc_clnt *rpcb_clnt;
-        static struct rpcbind_args *map;
+        struct rpcbind_args *map;
         struct rpc_task *child;
         struct sockaddr_storage addr;
         struct sockaddr *sap = (struct sockaddr *)&addr;
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index a27406b1654f..4814e246a874 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -616,30 +616,25 @@ static void __rpc_execute(struct rpc_task *task)
         BUG_ON(RPC_IS_QUEUED(task));
 
         for (;;) {
+                void (*do_action)(struct rpc_task *);
 
                 /*
-                 * Execute any pending callback.
+                 * Execute any pending callback first.
                  */
-                if (task->tk_callback) {
-                        void (*save_callback)(struct rpc_task *);
-
-                        /*
-                         * We set tk_callback to NULL before calling it,
-                         * in case it sets the tk_callback field itself:
-                         */
-                        save_callback = task->tk_callback;
-                        task->tk_callback = NULL;
-                        save_callback(task);
-                } else {
+                do_action = task->tk_callback;
+                task->tk_callback = NULL;
+                if (do_action == NULL) {
                         /*
                          * Perform the next FSM step.
-                         * tk_action may be NULL when the task has been killed
-                         * by someone else.
+                         * tk_action may be NULL if the task has been killed.
+                         * In particular, note that rpc_killall_tasks may
+                         * do this at any time, so beware when dereferencing.
                          */
-                        if (task->tk_action == NULL)
+                        do_action = task->tk_action;
+                        if (do_action == NULL)
                                 break;
-                        task->tk_action(task);
                 }
+                do_action(task);
 
                 /*
                  * Lockless check for whether task is sleeping or not.