From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751944AbaL1QMt (ORCPT ); Sun, 28 Dec 2014 11:12:49 -0500 Received: from mail-pa0-f44.google.com ([209.85.220.44]:40998 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751818AbaL1QMr (ORCPT ); Sun, 28 Dec 2014 11:12:47 -0500 From: Aniroop Mathur To: , , , , Cc: , Subject: [PATCH] s390: Initialize nr_devices count variable to -1 Date: Sun, 28 Dec 2014 21:42:53 +0530 Message-Id: <1419783173-3066-1-git-send-email-aniroop.mathur@gmail.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Aniroop Mathur This patch initializes nr_device count variable to -1 to avoid extra subtraction operation performed everytime scm block device is set up. Signed-off-by: Aniroop Mathur --- drivers/s390/block/scm_blk.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/s390/block/scm_blk.c b/drivers/s390/block/scm_blk.c index 76bed17..ee2bd6f 100644 --- a/drivers/s390/block/scm_blk.c +++ b/drivers/s390/block/scm_blk.c @@ -23,7 +23,7 @@ static int scm_major; static DEFINE_SPINLOCK(list_lock); static LIST_HEAD(inactive_requests); static unsigned int nr_requests = 64; -static atomic_t nr_devices = ATOMIC_INIT(0); +static atomic_t nr_devices = ATOMIC_INIT(-1); module_param(nr_requests, uint, S_IRUGO); MODULE_PARM_DESC(nr_requests, "Number of parallel requests."); @@ -357,7 +357,7 @@ int scm_blk_dev_setup(struct scm_blk_dev *bdev, struct scm_device *scmdev) int len, ret = -ENOMEM; unsigned int devindex, nr_max_blk; - devindex = atomic_inc_return(&nr_devices) - 1; + devindex = atomic_inc_return(&nr_devices); /* scma..scmz + scmaa..scmzz */ if (devindex > 701) { ret = -ENODEV; -- 1.9.1