SUNRPC: Ensure rpc_call_async() always calls tk_ops->rpc_release()

Currently this will not happen if we exit before rpc_new_task() was called.
Also fix up rpc_run_task() to do the same (for consistency).

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

3 files changed, 26 insertions, 21 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 02c7d8c04c58..4aba15ad1d27 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -605,11 +605,14 @@ static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
         int status;
 
         atomic_inc(&data->count);
+        /*
+         * If rpc_run_task() ends up calling ->rpc_release(), we
+         * want to ensure that it takes the 'error' code path.
+         */
+        data->rpc_status = -ENOMEM;
         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
-        if (IS_ERR(task)) {
-                nfs4_opendata_free(data);
+        if (IS_ERR(task))
                 return PTR_ERR(task);
-        }
         status = nfs4_wait_for_completion_rpc_task(task);
         if (status != 0) {
                 data->cancelled = 1;
@@ -708,11 +711,14 @@ static int _nfs4_proc_open(struct nfs4_opendata *data)
         int status;
 
         atomic_inc(&data->count);
+        /*
+         * If rpc_run_task() ends up calling ->rpc_release(), we
+         * want to ensure that it takes the 'error' code path.
+         */
+        data->rpc_status = -ENOMEM;
         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
-        if (IS_ERR(task)) {
-                nfs4_opendata_free(data);
+        if (IS_ERR(task))
                 return PTR_ERR(task);
-        }
         status = nfs4_wait_for_completion_rpc_task(task);
         if (status != 0) {
                 data->cancelled = 1;
@@ -2959,10 +2965,8 @@ static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, co
         data->rpc_status = 0;
 
         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
-        if (IS_ERR(task)) {
-                nfs4_delegreturn_release(data);
+        if (IS_ERR(task))
                 return PTR_ERR(task);
-        }
         status = nfs4_wait_for_completion_rpc_task(task);
         if (status == 0) {
                 status = data->rpc_status;
@@ -3182,7 +3186,6 @@ static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
                 struct nfs_seqid *seqid)
 {
         struct nfs4_unlockdata *data;
-        struct rpc_task *task;
 
         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
         if (data == NULL) {
@@ -3192,10 +3195,7 @@ static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
 
         /* Unlock _before_ we do the RPC call */
         do_vfs_lock(fl->fl_file, fl);
-        task = rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
-        if (IS_ERR(task))
-                nfs4_locku_release_calldata(data);
-        return task;
+        return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
 }
 
 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
@@ -3376,10 +3376,8 @@ static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *f
                 data->arg.reclaim = 1;
         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
                         &nfs4_lock_ops, data);
-        if (IS_ERR(task)) {
-                nfs4_lock_release(data);
+        if (IS_ERR(task))
                 return PTR_ERR(task);
-        }
         ret = nfs4_wait_for_completion_rpc_task(task);
         if (ret == 0) {
                 ret = data->rpc_status;
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 6e71d6ace5a3..aa8965e9d307 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -495,15 +495,16 @@ rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
         int             status;
 
         /* If this client is slain all further I/O fails */
+        status = -EIO;
         if (clnt->cl_dead) 
-                return -EIO;
+                goto out_release;
 
         flags |= RPC_TASK_ASYNC;
 
         /* Create/initialize a new RPC task */
         status = -ENOMEM;
         if (!(task = rpc_new_task(clnt, flags, tk_ops, data)))
-                goto out;
+                goto out_release;
 
         /* Mask signals on GSS_AUTH upcalls */
         rpc_task_sigmask(task, &oldset);                
@@ -518,7 +519,10 @@ rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
                 rpc_release_task(task);
 
         rpc_restore_sigmask(&oldset);           
-out:
+        return status;
+out_release:
+        if (tk_ops->rpc_release != NULL)
+                tk_ops->rpc_release(data);
         return status;
 }
 
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index cd51b5468332..3fc13bea302d 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -921,8 +921,11 @@ struct rpc_task *rpc_run_task(struct rpc_clnt *clnt, int flags,
 {
         struct rpc_task *task;
         task = rpc_new_task(clnt, flags, ops, data);
-        if (task == NULL)
+        if (task == NULL) {
+                if (ops->rpc_release != NULL)
+                        ops->rpc_release(data);
                 return ERR_PTR(-ENOMEM);
+        }
         atomic_inc(&task->tk_count);
         rpc_execute(task);
         return task;