SUNRPC: Remove BKL around the RPC socket operations etc.

All internal RPC client operations should no longer depend on the BKL,
however lockd and NFS callbacks may still require it.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

net/sunrpc/clnt.c

@@ -27,6 +27,7 @@
 #include <linux/types.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/utsname.h>
 #include <linux/workqueue.h>
 
@@ -823,8 +824,10 @@ call_encode(struct rpc_task *task)
 	if (encode == NULL)
 		return;
 
+	lock_kernel();
 	task->tk_status = rpcauth_wrap_req(task, encode, req, p,
 			task->tk_msg.rpc_argp);
+	unlock_kernel();
 	if (task->tk_status == -ENOMEM) {
 		/* XXX: Is this sane? */
 		rpc_delay(task, 3*HZ);
@@ -1155,9 +1158,12 @@ call_decode(struct rpc_task *task)
 
 	task->tk_action = rpc_exit_task;
 
-	if (decode)
+	if (decode) {
+		lock_kernel();
 		task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
 						      task->tk_msg.rpc_resp);
+		unlock_kernel();
+	}
 	dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
 					task->tk_status);
 	return;

net/sunrpc/sched.c

@@ -588,7 +588,9 @@ void rpc_delay(struct rpc_task *task, unsigned long delay)
  */
 static void rpc_prepare_task(struct rpc_task *task)
 {
+	lock_kernel();
 	task->tk_ops->rpc_call_prepare(task, task->tk_calldata);
+	unlock_kernel();
 }
 
 /*
@@ -598,7 +600,9 @@ void rpc_exit_task(struct rpc_task *task)
 {
 	task->tk_action = NULL;
 	if (task->tk_ops->rpc_call_done != NULL) {
+		lock_kernel();
 		task->tk_ops->rpc_call_done(task, task->tk_calldata);
+		unlock_kernel();
 		if (task->tk_action != NULL) {
 			WARN_ON(RPC_ASSASSINATED(task));
 			/* Always release the RPC slot and buffer memory */
@@ -651,9 +655,7 @@ static int __rpc_execute(struct rpc_task *task)
 			 */
 			save_callback=task->tk_callback;
 			task->tk_callback=NULL;
-			lock_kernel();
 			save_callback(task);
-			unlock_kernel();
 		}
 
 		/*
@@ -664,9 +666,7 @@ static int __rpc_execute(struct rpc_task *task)
 		if (!RPC_IS_QUEUED(task)) {
 			if (task->tk_action == NULL)
 				break;
-			lock_kernel();
 			task->tk_action(task);
-			unlock_kernel();
 		}
 
 		/*