From patchwork Tue Jan 11 01:24:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Yingliang X-Patchwork-Id: 12709374 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 AA573C433EF for ; Tue, 11 Jan 2022 01:19:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346158AbiAKBTY (ORCPT ); Mon, 10 Jan 2022 20:19:24 -0500 Received: from szxga08-in.huawei.com ([45.249.212.255]:31085 "EHLO szxga08-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243319AbiAKBTX (ORCPT ); Mon, 10 Jan 2022 20:19:23 -0500 Received: from dggpeml500024.china.huawei.com (unknown [172.30.72.54]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4JXt6q1D8wz1FCcr; Tue, 11 Jan 2022 09:15:47 +0800 (CST) Received: from dggpeml500017.china.huawei.com (7.185.36.243) by dggpeml500024.china.huawei.com (7.185.36.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Tue, 11 Jan 2022 09:19:21 +0800 Received: from huawei.com (10.175.103.91) by dggpeml500017.china.huawei.com (7.185.36.243) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Tue, 11 Jan 2022 09:19:21 +0800 From: Yang Yingliang To: , , CC: , , Subject: [PATCH -next v2] scsi: efct: don't use GFP_KERNEL under spin lock Date: Tue, 11 Jan 2022 09:24:41 +0800 Message-ID: <20220111012441.3232527-1-yangyingliang@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.175.103.91] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To dggpeml500017.china.huawei.com (7.185.36.243) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org GFP_KERNEL/GFP_DMA can't be used under a spin lock, according the comment of els_ios_lock, it's used to protect els ios list, so we can move down the spin lock to avoid using this flag under the lock. Reported-by: Hulk Robot Fixes: 8f406ef72859 ("scsi: elx: libefc: Extended link Service I/O handling") Signed-off-by: Yang Yingliang Reviewed-by: James Smart --- v2: move up unlock to just protect list_add_tail() --- drivers/scsi/elx/libefc/efc_els.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/elx/libefc/efc_els.c b/drivers/scsi/elx/libefc/efc_els.c index 7bb4f9aad2c8..84bc81d7ce76 100644 --- a/drivers/scsi/elx/libefc/efc_els.c +++ b/drivers/scsi/elx/libefc/efc_els.c @@ -46,18 +46,14 @@ efc_els_io_alloc_size(struct efc_node *node, u32 reqlen, u32 rsplen) efc = node->efc; - spin_lock_irqsave(&node->els_ios_lock, flags); - if (!node->els_io_enabled) { efc_log_err(efc, "els io alloc disabled\n"); - spin_unlock_irqrestore(&node->els_ios_lock, flags); return NULL; } els = mempool_alloc(efc->els_io_pool, GFP_ATOMIC); if (!els) { atomic_add_return(1, &efc->els_io_alloc_failed_count); - spin_unlock_irqrestore(&node->els_ios_lock, flags); return NULL; } @@ -74,7 +70,6 @@ efc_els_io_alloc_size(struct efc_node *node, u32 reqlen, u32 rsplen) &els->io.req.phys, GFP_KERNEL); if (!els->io.req.virt) { mempool_free(els, efc->els_io_pool); - spin_unlock_irqrestore(&node->els_ios_lock, flags); return NULL; } @@ -94,10 +89,11 @@ efc_els_io_alloc_size(struct efc_node *node, u32 reqlen, u32 rsplen) /* add els structure to ELS IO list */ INIT_LIST_HEAD(&els->list_entry); + spin_lock_irqsave(&node->els_ios_lock, flags); list_add_tail(&els->list_entry, &node->els_ios_list); + spin_unlock_irqrestore(&node->els_ios_lock, flags); } - spin_unlock_irqrestore(&node->els_ios_lock, flags); return els; }