linux-kernel - Re: [PATCH] fpga: fpga-mgr: remove unnecessary code in __fpga_mgr

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Message-ID: <CANk1AXQX24U06SBuoBmw=UWeCdnu3OV4BW2ZRBW4t1KirZZ5DA@mail.gmail.com>
Date:   Fri, 27 Oct 2017 13:30:57 -0500
From:   Alan Tull <atull@...nel.org>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Cc:     Moritz Fischer <mdf@...nel.org>, linux-fpga@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fpga: fpga-mgr: remove unnecessary code in __fpga_mgr_get

On Thu, Oct 26, 2017 at 6:02 PM, Gustavo A. R. Silva
<garsilva@...eddedor.com> wrote:

Hi Gustavo,

Thanks for pointing that out.  There's also a similar thing in
fpga-bridge.c that I need to fix.

Alan

> Notice that mgr = to_fpga_manager(dev); expands to:
>
> mgr = container_of(dev, struct fpga_manager, dev);
>
> and container_of is never null, so this null check is
> unnecessary.
>
> Addresses-Coverity-ID: 1397916
> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
> ---
>  drivers/fpga/fpga-mgr.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
> index 188ffef..33063ca 100644
> --- a/drivers/fpga/fpga-mgr.c
> +++ b/drivers/fpga/fpga-mgr.c
> @@ -367,8 +367,6 @@ static struct fpga_manager *__fpga_mgr_get(struct device *dev)
>         int ret = -ENODEV;
>
>         mgr = to_fpga_manager(dev);
> -       if (!mgr)
> -               goto err_dev;
>
>         /* Get exclusive use of fpga manager */
>         if (!mutex_trylock(&mgr->ref_mutex)) {
> --
> 2.7.4
>