linux-kernel - Re: [PATCH] clk: Add (devm_)clk_get

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Date:   Tue, 20 Nov 2018 15:26:19 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Phil Edworthy <phil.edworthy@...esas.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Russell King <linux@...linux.org.uk>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhc@...ote.com>, Guan Xuetao <gxt@....edu.cn>,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...ux-mips.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] clk: Add (devm_)clk_get_optional() functions

On Tue, Nov 20, 2018 at 01:56:52PM +0100, Uwe Kleine-König wrote:
> On Tue, Nov 20, 2018 at 12:38:33PM +0200, Andy Shevchenko wrote:
> > On Mon, Nov 19, 2018 at 02:12:59PM +0000, Phil Edworthy wrote:
> > > +	if (clk == ERR_PTR(-ENOENT))
> > > +		return NULL;
> > > +	else
> > > +		return clk;
> > 
> > return clk == ERR_PTR(-ENOENT) ? NULL : clk;
> > 
> > ?
> 
> Not sure this adds to the readability of the expression. Personally I
> prefer the explicit if. Maybe even:
> 
> 	clk = clk_get(...);
> 
> 	if (clk == ERR_PTR(-ENOENT))
> 		clk = NULL;
> 
> 	return clk;

So, it almost repeats the initial variant.
I'm fine with no 'else' in initial code, like

if (...)
	return NULL;

return clk;


-- 
With Best Regards,
Andy Shevchenko