From patchwork Fri May 15 03:42:00 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Calvin Owens X-Patchwork-Id: 6411001 Return-Path: X-Original-To: patchwork-linux-scsi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id D92E29F318 for ; Fri, 15 May 2015 03:43:47 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0F3DB20461 for ; Fri, 15 May 2015 03:43:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CEBA520306 for ; Fri, 15 May 2015 03:43:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934114AbbEODm6 (ORCPT ); Thu, 14 May 2015 23:42:58 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:59395 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933908AbbEODmq (ORCPT ); Thu, 14 May 2015 23:42:46 -0400 Received: from pps.filterd (m0004077 [127.0.0.1]) by mx0b-00082601.pphosted.com (8.14.5/8.14.5) with SMTP id t4F3bSLp011715; Thu, 14 May 2015 20:42:43 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=facebook; bh=/NJvDqZIrItl8ZVHXxwRE2TIyugTPkexQDnEQ2L6rqI=; b=C/TyKz4K+v693NV5tvK5iadJK6zuLnP9K3xmplvXFCs/IL5aHAiYbdA/q+LdsWPFWtOn laxfEqDWpc0yOXBoLO7q8ZM4oWAr85FMJualPwvMZH6O2InlbJzP/oKwCm5Ld0Pmm+Qf h732pIVKL5k7y+yXfak1suErQHHoCBA+CSA= Received: from mail.thefacebook.com ([199.201.64.23]) by mx0b-00082601.pphosted.com with ESMTP id 1ud79tr7t7-5 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT); Thu, 14 May 2015 20:42:43 -0700 Received: from devbig030.prn2.facebook.com (192.168.52.13) by PRN-CHUB04.TheFacebook.com (192.168.16.14) with Microsoft SMTP Server id 14.3.195.1; Thu, 14 May 2015 20:42:36 -0700 From: Calvin Owens To: Nagalakshmi Nandigama , Praveen Krishnamoorthy , Sreekanth Reddy , Abhijit Mahajan CC: , , , , Subject: [PATCH 4/6] Add refcount to fw_event_work struct Date: Thu, 14 May 2015 20:42:00 -0700 Message-ID: <1431661322-3097935-5-git-send-email-calvinowens@fb.com> X-Mailer: git-send-email 1.8.1 In-Reply-To: <1431661322-3097935-1-git-send-email-calvinowens@fb.com> References: <20150506184852.GA1007288@mail.thefacebook.com> <1431661322-3097935-1-git-send-email-calvinowens@fb.com> MIME-Version: 1.0 X-Originating-IP: [192.168.52.13] X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.14.151, 1.0.33, 0.0.0000 definitions=2015-05-15_01:2015-05-14, 2015-05-15, 1970-01-01 signatures=0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID,T_RP_MATCHES_RCVD,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The fw_event_work struct is concurrently referenced at shutdown, so add a refcount to protect it. Signed-off-by: Calvin Owens --- drivers/scsi/mpt2sas/mpt2sas_scsih.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c index 9645055..611b34d 100644 --- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c +++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c @@ -176,9 +176,37 @@ struct fw_event_work { u8 VP_ID; u8 ignore; u16 event; + struct kref refcount; char event_data[0] __aligned(4); }; +static void fw_event_work_free(struct kref *r) +{ + kfree(container_of(r, struct fw_event_work, refcount)); +} + +static void fw_event_work_get(struct fw_event_work *fw_work) +{ + kref_get(&fw_work->refcount); +} + +static void fw_event_work_put(struct fw_event_work *fw_work) +{ + kref_put(&fw_work->refcount, fw_event_work_free); +} + +static struct fw_event_work *alloc_fw_event_work(int len) +{ + struct fw_event_work *fw_event; + + fw_event = kzalloc(sizeof(*fw_event) + len, GFP_ATOMIC); + if (!fw_event) + return NULL; + + kref_init(&fw_event->refcount); + return fw_event; +} + /* raid transport support */ static struct raid_template *mpt2sas_raid_template;