Re: [PATCH] fix a code style in drivers/char/virtio_console.c
From: Steven Liu
Date: Tue May 18 2010 - 02:48:15 EST
okay, i see, thanks for your regards :)
2010/5/18 Amit Shah <amit.shah@xxxxxxxxxx>:
> Hello,
>
> On (Tue) May 18 2010 [13:41:29], Steven Liu wrote:
>> Hi, Amit,
>>
>> if 'err' initialised in this path, it needn't do err = -ENOMEM
>> after,isn't it?
>
> What I mean is if we later add some code that just does:
>
> if (err)
> goto fail;
>
> then 'ret' can be -ENOMEM, as it was initialised to, which would be
> fine. But if a later patch adds something like:
>
> + ret = -EIO;
> + err = ...
> + if (err)
> + goto fail;
> +
> err = ...
> if (err)
> goto fail;
>
> In this case, the 2nd if() would now return EIO instead of ENOMEM as
> earlier.
>
> Also, this style of coding can prevent uninitialised usage of 'ret', eg:
>
>
> int ret;
>
> if (err)
> goto fail;
>
> fail:
> return ret;
>
> In this case, the compiler will warn about 'ret' being used
> uninitialised.
>
> This is just a coding style issue. I had initially coded it the way your
> patch does, but Rusty asked me to change that and I like this new style
> better: there's less scope for surprises.
>
> Amit
>
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