netdev - Re: [PATCH v2 net-next] net: remove useless if check from register

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Message-ID: <CAADnVQJwP+ThozpeKOEvzoJRkYQvZgWyM9U+ixyeKKH9nkNb6w@mail.gmail.com>
Date:	Thu, 13 Feb 2014 08:23:08 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Denis Kirjanov <kda@...ux-powerpc.org>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next] net: remove useless if check from register_netdevice()

On Wed, Feb 12, 2014 at 8:47 PM, Denis Kirjanov <kda@...ux-powerpc.org> wrote:
> remove useless if check from register_netdevice()
>
> Signed-off-by: Denis Kirjanov <kda@...ux-powerpc.org>
> ---
> v1 -> v2: Fixed identation
> ---
>  net/core/dev.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 4ad1b78..21a72ad 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -5876,8 +5876,7 @@ int register_netdevice(struct net_device *dev)
>         if (dev->netdev_ops->ndo_init) {
>                 ret = dev->netdev_ops->ndo_init(dev);
>                 if (ret) {
> -                       if (ret > 0)
> -                               ret = -EIO;
> +                       ret = -EIO;
>                         goto out;

why is it a useless check?
seems perfectly valid to me.
most of the time ndo_init() returns negative error code like -ENOMEM
which we want
to propagate further down and want to override it to -EIO if it's > 0
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