linux-kernel - Re: [PATCH v5 3/3] watchdog: zx2967: add watchdog controller driver for ZTE's zx2967 family

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Date:   Tue, 24 Jan 2017 18:43:21 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Baoyou Xie <baoyou.xie@...aro.org>
Cc:     Jun Nie <jun.nie@...aro.org>, wim@...ana.be,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-watchdog@...r.kernel.org,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        "xie.baoyou" <xie.baoyou@....com.cn>, chen.chaokai@....com.cn,
        wang.qiang01@....com.cn
Subject: Re: [PATCH v5 3/3] watchdog: zx2967: add watchdog controller driver
 for ZTE's zx2967 family

On 01/24/2017 06:16 PM, Baoyou Xie wrote:
>
[ ... ]
>         +
>         +       ret = of_parse_phandle_with_fixed_args(dev->of_node,
>         +                       "zte,wdt-reset-sysctrl", 3, 0, &out_args);
>         +       if (ret)
>         +               return;
>         +
>         +       offset = out_args.args[0];
>         +       config = out_args.args[1];
>         +       mask = out_args.args[2];
>         +
>         +       regmap = syscon_node_to_regmap(out_args.np <http://out_args.np>);
>         +       if (IS_ERR(regmap))
>         +               return;
>         +
>         +       regmap_update_bits(regmap, offset, mask, config);
>
>
>     Another comment suggested adding
>             of_node_put(out_args.np <http://out_args.np>);
>     here.
>
>
> is it really? most of the driver that call this function don't call of_node_put. but it seems harmless to call of_node_put.
>
>
Even if everyone else is doing things wrong, that doesn't mean
that you should do the same, nor is it a good idea to use it
as argument.

Guenter