From nobody Sat Sep 13 09:16:56 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1FB9BC636CC for ; Fri, 3 Feb 2023 04:12:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232315AbjBCEMU (ORCPT ); Thu, 2 Feb 2023 23:12:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45234 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232392AbjBCEMI (ORCPT ); Thu, 2 Feb 2023 23:12:08 -0500 Received: from m12.mail.163.com (m12.mail.163.com [220.181.12.199]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E37C289F98; Thu, 2 Feb 2023 20:12:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=WrR// zva4ZesymP/eKoj5KyCPnat+CUvA7ZEtVA4JNA=; b=nxOlHKommfrlibSizMmPx DutsLeIDJQP8sGT9cquP1vr2436CwSUO2ewBsF8J9eyOmRVFaX/+GzZ0SLHJmkRg petgKK4VnkZIGuJixy0LkGcz/CIAB5liAGPMhNhdCi5de9Ovf2ReMYnpfTLVicSU jrj2cbuxWjEyNVPO8GL75U= Received: from leanderwang-LC2.localdomain (unknown [111.206.145.21]) by zwqz-smtp-mta-g2-2 (Coremail) with SMTP id _____wBnbNCFidxj79KlCg--.56852S2; Fri, 03 Feb 2023 12:11:49 +0800 (CST) From: Zheng Wang To: colyli@suse.de Cc: hackerzheng666@gmail.com, kent.overstreet@gmail.com, linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org, alex000young@gmail.com, Zheng Wang , stable@vger.kernel.org Subject: [PATCH v3] bcache: Remove some unnecessary NULL point check for the return value of __bch_btree_node_alloc-related pointer Date: Fri, 3 Feb 2023 12:11:47 +0800 Message-Id: <20230203041147.581389-1-zyytlz.wz@163.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: _____wBnbNCFidxj79KlCg--.56852S2 X-Coremail-Antispam: 1Uf129KBjvJXoWxAr48WF4xXrW3Aw4ktFWxtFb_yoW5CF1Dpr W29ryayr97Xr4UCr9Yg3WvvFyfXw12vFWUWr93u3WfZry7AFyrCay0934jvrWUuFWxuF4U Zr40yw1UXr4UtF7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0ziIPfLUUUUU= X-Originating-IP: [111.206.145.21] X-CM-SenderInfo: h2113zf2oz6qqrwthudrp/xtbBzgwLU2I0XNypJwAAsC Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Due to the previously fix of __bch_btree_node_alloc, the return value will never be a NULL pointer. So IS_ERR is enough to handle the failure situation. Fix it by replacing IS_ERR_OR_NULL check to IS_ERR check. Fixes: cafe56359144 ("bcache: A block layer cache") Cc: stable@vger.kernel.org Signed-off-by: Zheng Wang --- v3: - Add Cc: stable@vger.kernel.org suggested by Eric v2: - Replace more checks --- drivers/md/bcache/btree.c | 10 +++++----- drivers/md/bcache/super.c | 4 ++-- 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index 147c493a989a..7c21e54468bf 100644 --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -1138,7 +1138,7 @@ static struct btree *btree_node_alloc_replacement(str= uct btree *b, { struct btree *n =3D bch_btree_node_alloc(b->c, op, b->level, b->parent); =20 - if (!IS_ERR_OR_NULL(n)) { + if (!IS_ERR(n)) { mutex_lock(&n->write_lock); bch_btree_sort_into(&b->keys, &n->keys, &b->c->sort); bkey_copy_key(&n->key, &b->key); @@ -1340,7 +1340,7 @@ static int btree_gc_coalesce(struct btree *b, struct = btree_op *op, memset(new_nodes, 0, sizeof(new_nodes)); closure_init_stack(&cl); =20 - while (nodes < GC_MERGE_NODES && !IS_ERR_OR_NULL(r[nodes].b)) + while (nodes < GC_MERGE_NODES && !IS_ERR(r[nodes].b)) keys +=3D r[nodes++].keys; =20 blocks =3D btree_default_blocks(b->c) * 2 / 3; @@ -1352,7 +1352,7 @@ static int btree_gc_coalesce(struct btree *b, struct = btree_op *op, =20 for (i =3D 0; i < nodes; i++) { new_nodes[i] =3D btree_node_alloc_replacement(r[i].b, NULL); - if (IS_ERR_OR_NULL(new_nodes[i])) + if (IS_ERR(new_nodes[i])) goto out_nocoalesce; } =20 @@ -1487,7 +1487,7 @@ static int btree_gc_coalesce(struct btree *b, struct = btree_op *op, bch_keylist_free(&keylist); =20 for (i =3D 0; i < nodes; i++) - if (!IS_ERR_OR_NULL(new_nodes[i])) { + if (!IS_ERR(new_nodes[i])) { btree_node_free(new_nodes[i]); rw_unlock(true, new_nodes[i]); } @@ -1669,7 +1669,7 @@ static int bch_btree_gc_root(struct btree *b, struct = btree_op *op, if (should_rewrite) { n =3D btree_node_alloc_replacement(b, NULL); =20 - if (!IS_ERR_OR_NULL(n)) { + if (!IS_ERR(n)) { bch_btree_node_write_sync(n); =20 bch_btree_set_root(n); diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index ba3909bb6bea..7660962e7b8b 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -1724,7 +1724,7 @@ static void cache_set_flush(struct closure *cl) if (!IS_ERR_OR_NULL(c->gc_thread)) kthread_stop(c->gc_thread); =20 - if (!IS_ERR_OR_NULL(c->root)) + if (!IS_ERR(c->root)) list_add(&c->root->list, &c->btree_cache); =20 /* @@ -2088,7 +2088,7 @@ static int run_cache_set(struct cache_set *c) =20 err =3D "cannot allocate new btree root"; c->root =3D __bch_btree_node_alloc(c, NULL, 0, true, NULL); - if (IS_ERR_OR_NULL(c->root)) + if (IS_ERR(c->root)) goto err; =20 mutex_lock(&c->root->write_lock); --=20 2.25.1