sunrpc: fix error path in module_init

register_rpc_pipefs() needs to clean up rpc_inode_cache
by kmem_cache_destroy() on register_filesystem() failure.

init_sunrpc() needs to unregister rpc_pipe_fs by unregister_rpc_pipefs()
when rpc_init_mempool() returns error.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

net/sunrpc/rpc_pipe.c

@@ -845,6 +845,8 @@ init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
 
 int register_rpc_pipefs(void)
 {
+	int err;
+
 	rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
 				sizeof(struct rpc_inode),
 				0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
@@ -852,7 +854,12 @@ int register_rpc_pipefs(void)
 				init_once, NULL);
 	if (!rpc_inode_cachep)
 		return -ENOMEM;
-	register_filesystem(&rpc_pipe_fs_type);
+	err = register_filesystem(&rpc_pipe_fs_type);
+	if (err) {
+		kmem_cache_destroy(rpc_inode_cachep);
+		return err;
+	}
+
 	return 0;
 }
 

net/sunrpc/sunrpc_syms.c

@@ -146,9 +146,11 @@ init_sunrpc(void)
 	int err = register_rpc_pipefs();
 	if (err)
 		goto out;
-	err = rpc_init_mempool() != 0;
-	if (err)
+	err = rpc_init_mempool();
+	if (err) {
+		unregister_rpc_pipefs();
 		goto out;
+	}
 #ifdef RPC_DEBUG
 	rpc_register_sysctl();
 #endif