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

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Message-ID: <20190304063623.GA15253@mtr-leonro.mtl.com>
Date:   Mon, 4 Mar 2019 08:36:23 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Colin 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 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)".

I looked on the change which triggered Coverity warning and looks like
your commit message should include this Fixes line:
Fixes: 899444505473 ("IB/{hw,sw}: Remove 'uobject->context' dependency in object creation APIs")

Thanks

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