linux-kernel - Re: [PATCH] RDMA/bnxt_re: Drop unnecessary NULL checks after container

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Message-ID: <20210520150239.GC2734122@nvidia.com>
Date:   Thu, 20 May 2021 12:02:39 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Selvin Xavier <selvin.xavier@...adcom.com>,
        Devesh Sharma <devesh.sharma@...adcom.com>,
        Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RDMA/bnxt_re: Drop unnecessary NULL checks after
 container_of

On Fri, May 14, 2021 at 08:36:06AM -0700, Guenter Roeck wrote:
> The result of container_of() operations is never NULL unless the first
> element of the embedding structure is extracted. This is either not the
> case here, or the pointer passed to container_of() is known to be not
> NULL. The NULL checks are therefore unnecessary and misleading.
> Remove them.
> 
> The channges in this patch were made automatically with the following
> Coccinelle script.
> 
> @@
> type t;
> identifier v;
> statement s;
> @@
> 
> <+...
> (
>   t v = container_of(...);
> |
>   v = container_of(...);
> )
>   ...
>   when != v
> - if (\( !v \| v == NULL \) ) s
> ...+>
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  drivers/infiniband/hw/bnxt_re/ib_verbs.c | 18 ------------------
>  drivers/infiniband/hw/bnxt_re/main.c     | 12 ------------
>  2 files changed, 30 deletions(-)

Applied to for-next, thanks

Jason