linux-kernel - Re: [PATCH v3 4/4] clk: pmc-atom: use devm_kstrdup

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Date:   Mon, 24 Sep 2018 13:44:19 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Arend van Spriel <aspriel@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Robin Murphy <robin.murphy@....com>,
        Joe Perches <joe@...ches.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Michal Hocko <mhocko@...e.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Jonathan Corbet <corbet@....net>, Roman Gushchin <guro@...com>,
        Huang Ying <ying.huang@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm@...ck.org
Subject: Re: [PATCH v3 4/4] clk: pmc-atom: use devm_kstrdup_const()

pon., 24 wrz 2018 o 13:23 Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> napisał(a):
>
> On Mon, Sep 24, 2018 at 12:11:50PM +0200, Bartosz Golaszewski wrote:
> > Use devm_kstrdup_const() in the pmc-atom driver. This mostly serves as
> > an example of how to use this new routine to shrink driver code.
> >
> > While we're at it: replace a call to kcalloc() with devm_kcalloc().
>
> > @@ -352,8 +344,6 @@ static int plt_clk_probe(struct platform_device *pdev)
> >               goto err_drop_mclk;
> >       }
> >
> > -     plt_clk_free_parent_names_loop(parent_names, data->nparents);
> > -
> >       platform_set_drvdata(pdev, data);
> >       return 0;
>
> I don't think this is a good example.
>
> You changed a behaviour here in the way that you keep all chunks of memory
> (even small enough for pointers) during entire life time of the driver, which
> pretty likely would be forever till next boot.
>
> In the original case the memory was freed immediately in probe either it fails
> or returns with success.
>
> NAK, sorry.
>
>

I see.

I'd like to still merge patches 1-3 and then I'd come up with better
examples for the next release cycle once these are in?

Bart