From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755624AbeEaQCH (ORCPT ); Thu, 31 May 2018 12:02:07 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:50968 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755606AbeEaQCE (ORCPT ); Thu, 31 May 2018 12:02:04 -0400 Date: Thu, 31 May 2018 12:02:02 -0400 From: Mike Snitzer To: Wei Yongjun Cc: Alasdair Kergon , Mikulas Patocka , dm-devel@redhat.com, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: Re: [PATCH -next] dm writecache: fix return value check in writecache_ctr() Message-ID: <20180531160202.GA11300@redhat.com> References: <1527767595-76082-1-git-send-email-weiyongjun1@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1527767595-76082-1-git-send-email-weiyongjun1@huawei.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 31 2018 at 7:53am -0400, Wei Yongjun wrote: > Function dm_io_client_create() and dm_kcopyd_client_create() return > ERR_PTR() not NULL in case of error. The NULL test in the return value > check should be replaced with IS_ERR() > > Fixes: 2105231db61b ("dm: add writecache target") > Signed-off-by: Wei Yongjun > --- > drivers/md/dm-writecache.c | 10 ++++++---- > 1 file changed, 6 insertions(+), 4 deletions(-) > > diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c > index 844c4fb..0b2b436 100644 > --- a/drivers/md/dm-writecache.c > +++ b/drivers/md/dm-writecache.c > @@ -1872,9 +1872,10 @@ static int writecache_ctr(struct dm_target *ti, unsigned argc, char **argv) > } > > wc->dm_io = dm_io_client_create(); > - if (!wc->dm_io) { > - r = -ENOMEM; > + if (IS_ERR(wc->dm_io)) { > + r = PTR_ERR(wc->dm_io); > ti->error = "Unable to allocate dm-io client"; > + wc->dm_io = NULL; > goto bad; > } > > @@ -2096,9 +2097,10 @@ static int writecache_ctr(struct dm_target *ti, unsigned argc, char **argv) > } > > wc->dm_kcopyd = dm_kcopyd_client_create(&dm_kcopyd_throttle); > - if (!wc->dm_kcopyd) { > - r = -ENOMEM; > + if (IS_ERR(wc->dm_kcopyd)) { > + r = PTR_ERR(wc->dm_kcopyd); > ti->error = "Unable to allocate dm-kcopyd client"; > + wc->dm_kcopyd = NULL; > goto bad; > } > Yes, I forgot to pull this in.. it got lost in the shuffle. Mikulas had provided this same change (folded into a larger patch) yesterday, see: https://patchwork.kernel.org/patch/10439345/ I'll get this folded in ASAP. Thanks, Mike