linux-kernel - Re: [PATCH v7 1/5] powerpc/85xx: implement hardware timebase sync

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Message-ID: <CAOZdJXUeY-_mmBLoA25_g4eLqwHxYX4c_ECbU+KYqfM307THNQ@mail.gmail.com>
Date:	Tue, 3 Jul 2012 12:46:24 +0000
From:	Tabi Timur-B04825 <B04825@...escale.com>
To:	Zhao Chenhui-B35336 <B35336@...escale.com>
CC:	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	Wood Scott-B07421 <B07421@...escale.com>,
	"galak@...nel.crashing.org" <galak@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 1/5] powerpc/85xx: implement hardware timebase sync

On Tue, Jul 3, 2012 at 5:21 AM, Zhao Chenhui <chenhui.zhao@...escale.com> wrote:

> +       np = of_find_matching_node(NULL, mpc85xx_smp_guts_ids);
> +       if (np) {
> +               guts = of_iomap(np, 0);
> +               of_node_put(np);
> +               if (!guts) {
> +                       pr_err("%s: Could not map guts node address\n",
> +                                                               __func__);
> +                       return;
> +               }
> +               smp_85xx_ops.give_timebase = mpc85xx_give_timebase;
> +               smp_85xx_ops.take_timebase = mpc85xx_take_timebase;
> +       }

I had this in mind:

               guts = of_iomap(np, 0);
               of_node_put(np);
               if (guts) {
                       smp_85xx_ops.give_timebase = mpc85xx_give_timebase;
                       smp_85xx_ops.take_timebase = mpc85xx_take_timebase;
                } else {
                       pr_err("%s: Could not map guts node address\n",
                                                               __func__);
               }

That way, a missing GUTS node does not break everything.

-- 
Timur Tabi
Linux kernel developer at Freescale
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