1 files changed, 107 insertions, 30 deletions

diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index b92774231b3c..e86c527d87a1 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -17,6 +17,8 @@
 
 static struct socket *afs_socket; /* my RxRPC socket */
 static struct workqueue_struct *afs_async_calls;
+static atomic_t afs_outstanding_calls;
+static atomic_t afs_outstanding_skbs;
 
 static void afs_wake_up_call_waiter(struct afs_call *);
 static int afs_wait_for_call_to_complete(struct afs_call *);
@@ -45,6 +47,7 @@ static const struct afs_wait_mode afs_async_incoming_call = {
 
 /* asynchronous incoming call initial processing */
 static const struct afs_call_type afs_RXCMxxxx = {
+	.name		= "CB.xxxx",
 	.deliver	= afs_deliver_cm_op_id,
 	.abort_to_error	= afs_abort_to_error,
 };
@@ -118,10 +121,67 @@ void afs_close_socket(void)
 
 	_debug("dework");
 	destroy_workqueue(afs_async_calls);
+
+	ASSERTCMP(atomic_read(&afs_outstanding_skbs), ==, 0);
+	ASSERTCMP(atomic_read(&afs_outstanding_calls), ==, 0);
 	_leave("");
 }
 
 /*
+ * note that the data in a socket buffer is now delivered and that the buffer
+ * should be freed
+ */
+static void afs_data_delivered(struct sk_buff *skb)
+{
+	if (!skb) {
+		_debug("DLVR NULL [%d]", atomic_read(&afs_outstanding_skbs));
+		dump_stack();
+	} else {
+		_debug("DLVR %p{%u} [%d]",
+		       skb, skb->mark, atomic_read(&afs_outstanding_skbs));
+		if (atomic_dec_return(&afs_outstanding_skbs) == -1)
+			BUG();
+		rxrpc_kernel_data_delivered(skb);
+	}
+}
+
+/*
+ * free a socket buffer
+ */
+static void afs_free_skb(struct sk_buff *skb)
+{
+	if (!skb) {
+		_debug("FREE NULL [%d]", atomic_read(&afs_outstanding_skbs));
+		dump_stack();
+	} else {
+		_debug("FREE %p{%u} [%d]",
+		       skb, skb->mark, atomic_read(&afs_outstanding_skbs));
+		if (atomic_dec_return(&afs_outstanding_skbs) == -1)
+			BUG();
+		rxrpc_kernel_free_skb(skb);
+	}
+}
+
+/*
+ * free a call
+ */
+static void afs_free_call(struct afs_call *call)
+{
+	_debug("DONE %p{%s} [%d]",
+	       call, call->type->name, atomic_read(&afs_outstanding_calls));
+	if (atomic_dec_return(&afs_outstanding_calls) == -1)
+		BUG();
+
+	ASSERTCMP(call->rxcall, ==, NULL);
+	ASSERT(!work_pending(&call->async_work));
+	ASSERT(skb_queue_empty(&call->rx_queue));
+	ASSERT(call->type->name != NULL);
+
+	kfree(call->request);
+	kfree(call);
+}
+
+/*
  * allocate a call with flat request and reply buffers
  */
 struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type,
@@ -133,30 +193,32 @@ struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type,
 	if (!call)
 		goto nomem_call;
 
+	_debug("CALL %p{%s} [%d]",
+	       call, type->name, atomic_read(&afs_outstanding_calls));
+	atomic_inc(&afs_outstanding_calls);
+
+	call->type = type;
+	call->request_size = request_size;
+	call->reply_max = reply_size;
+
 	if (request_size) {
 		call->request = kmalloc(request_size, GFP_NOFS);
 		if (!call->request)
-			goto nomem_request;
+			goto nomem_free;
 	}
 
 	if (reply_size) {
 		call->buffer = kmalloc(reply_size, GFP_NOFS);
 		if (!call->buffer)
-			goto nomem_buffer;
+			goto nomem_free;
 	}
 
-	call->type = type;
-	call->request_size = request_size;
-	call->reply_max = reply_size;
-
 	init_waitqueue_head(&call->waitq);
 	skb_queue_head_init(&call->rx_queue);
 	return call;
 
-nomem_buffer:
-	kfree(call->request);
-nomem_request:
-	kfree(call);
+nomem_free:
+	afs_free_call(call);
 nomem_call:
 	return NULL;
 }
@@ -188,6 +250,12 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
 
 	_enter("%x,{%d},", addr->s_addr, ntohs(call->port));
 
+	ASSERT(call->type != NULL);
+	ASSERT(call->type->name != NULL);
+
+	_debug("MAKE %p{%s} [%d]",
+	       call, call->type->name, atomic_read(&afs_outstanding_calls));
+
 	call->wait_mode = wait_mode;
 	INIT_WORK(&call->async_work, afs_process_async_call);
 
@@ -203,6 +271,7 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
 	/* create a call */
 	rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key,
 					 (unsigned long) call, gfp);
+	call->key = NULL;
 	if (IS_ERR(rxcall)) {
 		ret = PTR_ERR(rxcall);
 		goto error_kill_call;
@@ -237,10 +306,10 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
 error_do_abort:
 	rxrpc_kernel_abort_call(rxcall, RX_USER_ABORT);
 	rxrpc_kernel_end_call(rxcall);
+	call->rxcall = NULL;
 error_kill_call:
 	call->type->destructor(call);
-	ASSERT(skb_queue_empty(&call->rx_queue));
-	kfree(call);
+	afs_free_call(call);
 	_leave(" = %d", ret);
 	return ret;
 }
@@ -257,15 +326,19 @@ static void afs_rx_interceptor(struct sock *sk, unsigned long user_call_ID,
 
 	_enter("%p,,%u", call, skb->mark);
 
+	_debug("ICPT %p{%u} [%d]",
+	       skb, skb->mark, atomic_read(&afs_outstanding_skbs));
+
 	ASSERTCMP(sk, ==, afs_socket->sk);
+	atomic_inc(&afs_outstanding_skbs);
 
 	if (!call) {
 		/* its an incoming call for our callback service */
-		__skb_queue_tail(&afs_incoming_calls, skb);
+		skb_queue_tail(&afs_incoming_calls, skb);
 		schedule_work(&afs_collect_incoming_call_work);
 	} else {
 		/* route the messages directly to the appropriate call */
-		__skb_queue_tail(&call->rx_queue, skb);
+		skb_queue_tail(&call->rx_queue, skb);
 		call->wait_mode->rx_wakeup(call);
 	}
 
@@ -317,9 +390,9 @@ static void afs_deliver_to_call(struct afs_call *call)
 				call->state = AFS_CALL_ERROR;
 				break;
 			}
-			rxrpc_kernel_data_delivered(skb);
+			afs_data_delivered(skb);
 			skb = NULL;
-			break;
+			continue;
 		case RXRPC_SKB_MARK_FINAL_ACK:
 			_debug("Rcv ACK");
 			call->state = AFS_CALL_COMPLETE;
@@ -350,19 +423,19 @@ static void afs_deliver_to_call(struct afs_call *call)
 			break;
 		}
 
-		rxrpc_kernel_free_skb(skb);
+		afs_free_skb(skb);
 	}
 
 	/* make sure the queue is empty if the call is done with (we might have
 	 * aborted the call early because of an unmarshalling error) */
 	if (call->state >= AFS_CALL_COMPLETE) {
 		while ((skb = skb_dequeue(&call->rx_queue)))
-			rxrpc_kernel_free_skb(skb);
+			afs_free_skb(skb);
 		if (call->incoming) {
 			rxrpc_kernel_end_call(call->rxcall);
+			call->rxcall = NULL;
 			call->type->destructor(call);
-			ASSERT(skb_queue_empty(&call->rx_queue));
-			kfree(call);
+			afs_free_call(call);
 		}
 	}
 
@@ -409,14 +482,14 @@ static int afs_wait_for_call_to_complete(struct afs_call *call)
 		_debug("call incomplete");
 		rxrpc_kernel_abort_call(call->rxcall, RX_CALL_DEAD);
 		while ((skb = skb_dequeue(&call->rx_queue)))
-			rxrpc_kernel_free_skb(skb);
+			afs_free_skb(skb);
 	}
 
 	_debug("call complete");
 	rxrpc_kernel_end_call(call->rxcall);
+	call->rxcall = NULL;
 	call->type->destructor(call);
-	ASSERT(skb_queue_empty(&call->rx_queue));
-	kfree(call);
+	afs_free_call(call);
 	_leave(" = %d", ret);
 	return ret;
 }
@@ -459,9 +532,7 @@ static void afs_delete_async_call(struct work_struct *work)
 
 	_enter("");
 
-	ASSERT(skb_queue_empty(&call->rx_queue));
-	ASSERT(!work_pending(&call->async_work));
-	kfree(call);
+	afs_free_call(call);
 
 	_leave("");
 }
@@ -489,6 +560,7 @@ static void afs_process_async_call(struct work_struct *work)
 
 		/* kill the call */
 		rxrpc_kernel_end_call(call->rxcall);
+		call->rxcall = NULL;
 		if (call->type->destructor)
 			call->type->destructor(call);
 
@@ -526,7 +598,7 @@ static void afs_collect_incoming_call(struct work_struct *work)
 		_debug("new call");
 
 		/* don't need the notification */
-		rxrpc_kernel_free_skb(skb);
+		afs_free_skb(skb);
 
 		if (!call) {
 			call = kzalloc(sizeof(struct afs_call), GFP_KERNEL);
@@ -541,6 +613,11 @@ static void afs_collect_incoming_call(struct work_struct *work)
 			init_waitqueue_head(&call->waitq);
 			skb_queue_head_init(&call->rx_queue);
 			call->state = AFS_CALL_AWAIT_OP_ID;
+
+			_debug("CALL %p{%s} [%d]",
+			       call, call->type->name,
+			       atomic_read(&afs_outstanding_calls));
+			atomic_inc(&afs_outstanding_calls);
 		}
 
 		rxcall = rxrpc_kernel_accept_call(afs_socket,
@@ -551,7 +628,8 @@ static void afs_collect_incoming_call(struct work_struct *work)
 		}
 	}
 
-	kfree(call);
+	if (call)
+		afs_free_call(call);
 }
 
 /*
@@ -629,8 +707,7 @@ void afs_send_empty_reply(struct afs_call *call)
 		rxrpc_kernel_end_call(call->rxcall);
 		call->rxcall = NULL;
 		call->type->destructor(call);
-		ASSERT(skb_queue_empty(&call->rx_queue));
-		kfree(call);
+		afs_free_call(call);
 		_leave(" [error]");
 		return;
 	}