From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Subject: Re: [PATCH -next] dm writecache: fix return value check in writecache_ctr() Date: Thu, 31 May 2018 12:07:12 -0400 Message-ID: <20180531160711.GB11300@redhat.com> References: <1527767595-76082-1-git-send-email-weiyongjun1@huawei.com> <20180531160202.GA11300@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20180531160202.GA11300@redhat.com> Sender: linux-kernel-owner@vger.kernel.org To: Wei Yongjun Cc: Alasdair Kergon , Mikulas Patocka , dm-devel@redhat.com, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org List-Id: dm-devel.ids On Thu, May 31 2018 at 12:02pm -0400, Mike Snitzer wrote: > 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. Turns out I already did fold it in. My push to linux-next just missed today's tree. So already taken care of. Thanks for sending the patch though. Mike From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Date: Thu, 31 May 2018 16:07:12 +0000 Subject: Re: [PATCH -next] dm writecache: fix return value check in writecache_ctr() Message-Id: <20180531160711.GB11300@redhat.com> List-Id: References: <1527767595-76082-1-git-send-email-weiyongjun1@huawei.com> <20180531160202.GA11300@redhat.com> In-Reply-To: <20180531160202.GA11300@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Wei Yongjun Cc: Alasdair Kergon , Mikulas Patocka , dm-devel@redhat.com, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org On Thu, May 31 2018 at 12:02pm -0400, Mike Snitzer wrote: > 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. Turns out I already did fold it in. My push to linux-next just missed today's tree. So already taken care of. Thanks for sending the patch though. Mike