Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934006AbbEODmt (ORCPT ); Thu, 14 May 2015 23:42:49 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:62159 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933705AbbEODmp (ORCPT ); Thu, 14 May 2015 23:42:45 -0400 From: Calvin Owens To: Nagalakshmi Nandigama , Praveen Krishnamoorthy , Sreekanth Reddy , Abhijit Mahajan CC: , , , , Subject: [PATCH 1/6] Add refcount to sas_device struct Date: Thu, 14 May 2015 20:41:57 -0700 Message-ID: <1431661322-3097935-2-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 Content-Type: text/plain 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-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1266 Lines: 46 These objects can be referenced concurrently throughout the driver, we need a way to make sure threads can't delete them out from under each other. Signed-off-by: Calvin Owens --- drivers/scsi/mpt2sas/mpt2sas_base.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h index caff8d1..2e7dc33 100644 --- a/drivers/scsi/mpt2sas/mpt2sas_base.h +++ b/drivers/scsi/mpt2sas/mpt2sas_base.h @@ -376,8 +376,24 @@ struct _sas_device { u8 phy; u8 responding; u8 pfa_led_on; + struct kref refcount; }; +static inline void sas_device_get(struct _sas_device *s) +{ + kref_get(&s->refcount); +} + +static inline void sas_device_free(struct kref *r) +{ + kfree(container_of(r, struct _sas_device, refcount)); +} + +static inline void sas_device_put(struct _sas_device *s) +{ + kref_put(&s->refcount, sas_device_free); +} + /** * struct _raid_device - raid volume link list * @list: sas device list -- 1.8.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/