linux-kernel - Re: [PATCH][next] RDMA/nes: remove redundant check on udata

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Message-ID: <20190307170108.GQ1789@mtr-leonro.mtl.com>
Date:   Thu, 7 Mar 2019 19:01:08 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Colin Ian King <colin.king@...onical.com>
Cc:     Faisal Latif <faisal.latif@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] RDMA/nes: remove redundant check on udata

On Thu, Mar 07, 2019 at 10:23:28AM +0000, Colin Ian King wrote:
> On 04/03/2019 06:36, Leon Romanovsky wrote:
> > On Sat, Mar 02, 2019 at 11:06:36PM +0000, Colin King wrote:
> >> From: Colin Ian King <colin.king@...onical.com>
> >>
> >> The non-null check on udata is redundant as this check was performed
> >> just a few statements earlier and the check is always true as udata
> >> must be non-null at this point. Remove redundant the check on udata
> >> and the redundant else part that can never be executed.
> >>
> >> Detected by CoverityScan, CID#1477317 ("Logically dead code")
> >>
> >> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> >> ---
> >>  drivers/infiniband/hw/nes/nes_verbs.c | 73 +++++++++++++--------------
> >>  1 file changed, 34 insertions(+), 39 deletions(-)
> >>
> >> diff --git a/drivers/infiniband/hw/nes/nes_verbs.c b/drivers/infiniband/hw/nes/nes_verbs.c
> >> index 828e4af3f951..526092d435df 100644
> >> --- a/drivers/infiniband/hw/nes/nes_verbs.c
> >> +++ b/drivers/infiniband/hw/nes/nes_verbs.c
> >> @@ -1039,53 +1039,48 @@ static struct ib_qp *nes_create_qp(struct ib_pd *ibpd,
> >>  				}
> >>  				if (req.user_qp_buffer)
> >>  					nesqp->nesuqp_addr = req.user_qp_buffer;
> >> -				if (udata) {
> >> -					nesqp->user_mode = 1;
> >
> > It was single place where user_mode was set, you should continue and
> > remove all code which depends on "if (nesqp->user_mode)".
>
> This is not the only place where user_mode is being set; we currently have:

ok, It doesn't matter, I'll clean it later with my memory allocation
conversion patches.

Thanks

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