From 561aa9e4bb987b08ba29cc4ff3b8b258b16b1fab Mon Sep 17 00:00:00 2001
From: Stanislav Kinsbursky <skinsbursky@parallels.com>
Date: Mon, 27 Feb 2012 22:05:45 +0400
Subject: [PATCH] --- yaml --- r: 294495 b: refs/heads/master c:
 2c9030eef9dbd0d737a7f55646da70d217fd6255 h: refs/heads/master i:   294493:
 99cfcd63770ae72cd1de6262d0ec19a71457e4fe   294491:
 965ecbc8fbccf543ee56f56be1111cb2cd41b4b3   294487:
 e5f10d8096f5c961a337d6c8ce1794c49ffe8727   294479:
 e706c0907791d6ce35c4d49b55a946917c0ac225   294463:
 19990dd74efcb46bfeee8c11818a34df902bd24b v: v3

---
 [refs]                      |  2 +-
 trunk/net/sunrpc/rpc_pipe.c | 32 +++++++++++++++++++-------------
 2 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/[refs] b/[refs]
index 9c1f28651cf1..70059749c1f6 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e9dbca8d732e20b8d31a3094a8669c014e7ee262
+refs/heads/master: 2c9030eef9dbd0d737a7f55646da70d217fd6255
diff --git a/trunk/net/sunrpc/rpc_pipe.c b/trunk/net/sunrpc/rpc_pipe.c
index 6873c9b51cc9..b67b2aecc4ff 100644
--- a/trunk/net/sunrpc/rpc_pipe.c
+++ b/trunk/net/sunrpc/rpc_pipe.c
@@ -174,6 +174,7 @@ rpc_close_pipes(struct inode *inode)
 		pipe->ops->release_pipe(inode);
 	cancel_delayed_work_sync(&pipe->queue_timeout);
 	rpc_inode_setowner(inode, NULL);
+	RPC_I(inode)->pipe = NULL;
 	mutex_unlock(&inode->i_mutex);
 }
 
@@ -203,12 +204,13 @@ rpc_destroy_inode(struct inode *inode)
 static int
 rpc_pipe_open(struct inode *inode, struct file *filp)
 {
-	struct rpc_pipe *pipe = RPC_I(inode)->pipe;
+	struct rpc_pipe *pipe;
 	int first_open;
 	int res = -ENXIO;
 
 	mutex_lock(&inode->i_mutex);
-	if (pipe->dentry == NULL)
+	pipe = RPC_I(inode)->pipe;
+	if (pipe == NULL)
 		goto out;
 	first_open = pipe->nreaders == 0 && pipe->nwriters == 0;
 	if (first_open && pipe->ops->open_pipe) {
@@ -229,12 +231,13 @@ rpc_pipe_open(struct inode *inode, struct file *filp)
 static int
 rpc_pipe_release(struct inode *inode, struct file *filp)
 {
-	struct rpc_pipe *pipe = RPC_I(inode)->pipe;
+	struct rpc_pipe *pipe;
 	struct rpc_pipe_msg *msg;
 	int last_close;
 
 	mutex_lock(&inode->i_mutex);
-	if (pipe->dentry == NULL)
+	pipe = RPC_I(inode)->pipe;
+	if (pipe == NULL)
 		goto out;
 	msg = filp->private_data;
 	if (msg != NULL) {
@@ -270,12 +273,13 @@ static ssize_t
 rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
 {
 	struct inode *inode = filp->f_path.dentry->d_inode;
-	struct rpc_pipe *pipe = RPC_I(inode)->pipe;
+	struct rpc_pipe *pipe;
 	struct rpc_pipe_msg *msg;
 	int res = 0;
 
 	mutex_lock(&inode->i_mutex);
-	if (pipe->dentry == NULL) {
+	pipe = RPC_I(inode)->pipe;
+	if (pipe == NULL) {
 		res = -EPIPE;
 		goto out_unlock;
 	}
@@ -313,13 +317,12 @@ static ssize_t
 rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
 {
 	struct inode *inode = filp->f_path.dentry->d_inode;
-	struct rpc_pipe *pipe = RPC_I(inode)->pipe;
 	int res;
 
 	mutex_lock(&inode->i_mutex);
 	res = -EPIPE;
-	if (pipe->dentry != NULL)
-		res = pipe->ops->downcall(filp, buf, len);
+	if (RPC_I(inode)->pipe != NULL)
+		res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len);
 	mutex_unlock(&inode->i_mutex);
 	return res;
 }
@@ -344,16 +347,18 @@ static long
 rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	struct inode *inode = filp->f_path.dentry->d_inode;
-	struct rpc_pipe *pipe = RPC_I(inode)->pipe;
+	struct rpc_pipe *pipe;
 	int len;
 
 	switch (cmd) {
 	case FIONREAD:
-		spin_lock(&pipe->lock);
-		if (pipe->dentry == NULL) {
-			spin_unlock(&pipe->lock);
+		mutex_lock(&inode->i_mutex);
+		pipe = RPC_I(inode)->pipe;
+		if (pipe == NULL) {
+			mutex_unlock(&inode->i_mutex);
 			return -EPIPE;
 		}
+		spin_lock(&pipe->lock);
 		len = pipe->pipelen;
 		if (filp->private_data) {
 			struct rpc_pipe_msg *msg;
@@ -361,6 +366,7 @@ rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 			len += msg->len - msg->copied;
 		}
 		spin_unlock(&pipe->lock);
+		mutex_unlock(&inode->i_mutex);
 		return put_user(len, (int __user *)arg);
 	default:
 		return -EINVAL;