linux-kernel - Re: [PATCH] of: Fix issue where code would fall through to error case.

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Message-ID: <CAJYdmeNnKtecshe3QSZCPnwEuNUFAW9cUsNS-Z1Chw7OPUJ2jQ@mail.gmail.com>
Date:   Thu, 17 Nov 2016 16:10:50 -0800
From:   Moritz Fischer <moritz.fischer.private@...il.com>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Moritz Fischer <moritz.fischer@...us.com>,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        pantelis.antoniou@...sulko.com, moritz@...e-entropy.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH] of: Fix issue where code would fall through to error case.

On Thu, Nov 17, 2016 at 4:02 PM, Frank Rowand <frowand.list@...il.com> wrote:
> On 11/17/16 15:40, Frank Rowand wrote:
>> On 11/17/16 15:25, Moritz Fischer wrote:
>>> No longer fall through into the error case that prints out
>>> an error if no error (err = 0) occurred.
>>>
>>> Fixes d9181b20a83(of: Add back an error message, restructured)
>>> Signed-off-by: Moritz Fischer <moritz.fischer@...us.com>
>>> ---
>>>  drivers/of/resolver.c | 6 +++++-
>>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/of/resolver.c b/drivers/of/resolver.c
>>> index 783bd09..785076d 100644
>>> --- a/drivers/of/resolver.c
>>> +++ b/drivers/of/resolver.c
>>> @@ -358,9 +358,13 @@ int of_resolve_phandles(struct device_node *overlay)
>>>
>>>              err = update_usages_of_a_phandle_reference(overlay, prop, phandle);
>>>              if (err)
>>> -                    break;
>>> +                    goto err_out;
>>>      }
>>>
>>> +    of_node_put(tree_symbols);
>>> +
>>> +    return 0;
>>> +
>>>  err_out:
>>>      pr_err("overlay phandle fixup failed: %d\n", err);
>>>  out:
>>
>> Thanks for catching that.
>>
>> Rob, please apply.
>>
>> Reviewed-by: Frank Rowand <frank.rowand@...sony.com>
>>
>> -Frank
>
> On second thought, isn't the common pattern when clean up is needed for
> both the no-error path and the error path something like:
>
>
>         out:
>                 of_node_put(tree_symbols);
>                 return err;
>
>         err_out:
>                 pr_err("overlay phandle fixup failed: %d\n", err);
>                 goto out;
>         }
>
>
> I don't have a strong opinion, whatever Rob wants to take is fine with me.

Same here. I tried to avoid the jumping back part, but if that's the
common pattern,
I can submit a v2 doing that instead.

Cheers,

Moritz