linux-kernel - Re: [PATCH] soc/tegra: refactor soc_is

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Date:   Wed, 21 Nov 2018 15:56:00 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Jon Hunter <jonathanh@...dia.com>
Cc:     Frank Lee <tiny.windzz@...il.com>, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc/tegra: refactor soc_is_tegra()

On Wed, Nov 21, 2018 at 02:50:54PM +0000, Jon Hunter wrote:
> 
> On 21/11/2018 14:47, Frank Lee wrote:
> > On Wed, Nov 21, 2018 at 10:43 PM Thierry Reding
> > <thierry.reding@...il.com> wrote:
> >>
> >> On Wed, Nov 21, 2018 at 02:34:57PM +0000, Jon Hunter wrote:
> >>>
> >>> On 21/11/2018 14:12, Yangtao Li wrote:
> >>>> of_find_node_by_path() acquires a reference to the node returned by
> >>>> it and that reference needs to be dropped by its caller.soc_is_tegra()
> >>>> doesn't do that, so fix it.Call of_machine_is_compatible() to refactor
> >>>> soc_is_tegra() whcih automatically manages the reference count.
> >>>>
> >>>> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> >>>> ---
> >>>>  drivers/soc/tegra/common.c | 12 +++++++-----
> >>>>  1 file changed, 7 insertions(+), 5 deletions(-)
> >>>>
> >>>> diff --git a/drivers/soc/tegra/common.c b/drivers/soc/tegra/common.c
> >>>> index cd8f41351add..0b40700b672a 100644
> >>>> --- a/drivers/soc/tegra/common.c
> >>>> +++ b/drivers/soc/tegra/common.c
> >>>> @@ -22,11 +22,13 @@ static const struct of_device_id tegra_machine_match[] = {
> >>>>
> >>>>  bool soc_is_tegra(void)
> >>>>  {
> >>>> -   struct device_node *root;
> >>>> +   struct of_device_id *match = tegra_machine_match;
> >>>>
> >>>> -   root = of_find_node_by_path("/");
> >>>> -   if (!root)
> >>>> -           return false;
> >>>> +   while(match->compatible){
> >>>> +           if(of_machine_is_compatible(match->compatible))
> >>>> +                   return true;
> >>>> +           match++;
> >>>> +   }
> >>>>
> >>>> -   return of_match_node(tegra_machine_match, root) != NULL;
> >>>> +   return false;
> >>>>  }
> >>>
> >>> Ugh ... sorry, I thought that of_machine_is_compatible() looped through
> >>> the matches. OK, let's stick with your initial fix.
> >>
> >> Actually I prefer this one. Even if it is slightly more verbose, I think
> >> it's much clearer what's actually going on. Also this hides all of the
> >> OF node reference counting in a core function, so it's worth the extra
> >> line, in my opinion.
> >>
> >> Thierry
> > Hi Jon：
> > 
> > I like both, how aboout you?
> 
> Yes fine with me too. However, looks like there is some formatting that
> needs to be fixed up above. Please make sure you run checkpatch.pl on
> your patches. Otherwise ...
> 
> Acked-by: Jon Hunter <jonathanh@...dia.com>
> 
> Thierry, pick up this version if you prefer.

Yeah, I noticed the formatting issues, but I can take care of them while
applying.

Thanks,
Thierry

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