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

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Message-ID: <CAL_JsqJK=Jf7JCmqD8EgEg3ngONWz=1Fu-Jj5h6-wkskTk_iXw@mail.gmail.com>
Date:   Wed, 23 Nov 2016 15:58:40 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Moritz Fischer <moritz.fischer.private@...il.com>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Moritz Fischer <moritz.fischer@...us.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        moritz@...e-entropy.org,
        "devicetree@...r.kernel.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 6:10 PM, Moritz Fischer
<moritz.fischer.private@...il.com> wrote:
> 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.

Both are ugly. Just do:

if (err)
  pr_err(...);

Rob