net/9p: p9_idpool_get return -1 on error

We need to return -1 on error. Also handle error properly

Signed-off-by: Aneesh Kumar K.V <[e-mail]>
Signed-off-by: Eric Van Hensbergen <[e-mail]>

net/9p/client.c

···
 	c->tagpool = p9_idpool_create();
 	if (IS_ERR(c->tagpool)) {
 		err = PTR_ERR(c->tagpool);
-		c->tagpool = NULL;
 		goto error;
 	}
-
-	p9_idpool_get(c->tagpool); /* reserve tag 0 */
-
+	err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
+	if (err < 0) {
+		p9_idpool_destroy(c->tagpool);
+		goto error;
+	}
 	c->max_tag = 0;
 error:
 	return err;
···
 	spin_lock_init(&clnt->lock);
 	INIT_LIST_HEAD(&clnt->fidlist);
 
-	p9_tag_init(clnt);
+	err = p9_tag_init(clnt);
+	if (err < 0)
+		goto free_client;
 
 	err = parse_opts(options, clnt);
 	if (err < 0)
-		goto free_client;
+		goto destroy_tagpool;
 
 	if (!clnt->trans_mod)
 		clnt->trans_mod = v9fs_get_default_trans();
···
 		err = -EPROTONOSUPPORT;
 		P9_DPRINTK(P9_DEBUG_ERROR,
 				"No transport defined or default transport\n");
-		goto free_client;
+		goto destroy_tagpool;
 	}
 
 	clnt->fidpool = p9_idpool_create();
 	if (IS_ERR(clnt->fidpool)) {
 		err = PTR_ERR(clnt->fidpool);
-		clnt->fidpool = NULL;
 		goto put_trans;
 	}
 
···
 	p9_idpool_destroy(clnt->fidpool);
 put_trans:
 	v9fs_put_trans(clnt->trans_mod);
+destroy_tagpool:
+	p9_idpool_destroy(clnt->tagpool);
 free_client:
 	kfree(clnt);
 	return ERR_PTR(err);

net/9p/util.c

···
 
 retry:
 	if (idr_pre_get(&p->pool, GFP_NOFS) == 0)
-		return 0;
+		return -1;
 
 	spin_lock_irqsave(&p->lock, flags);