linux-kernel - Re: drivers/net/chelsio/my3126.c: inconsequent NULL checking

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Date:	Thu, 7 Dec 2006 14:22:51 +0100
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Adrian Bunk" <bunk@...sta.de>
Cc:	"Stephen Hemminger" <shemminger@...l.org>, jgarzik@...ox.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: drivers/net/chelsio/my3126.c: inconsequent NULL checking

On 07/12/06, Adrian Bunk <bunk@...sta.de> wrote:
> The Coverity checker spotted the following inconsequent NULL checking
> introduced by commit f1d3d38af75789f1b82969b83b69cab540609789:
>
> <--  snip  -->
>
> ...
> static struct cphy *my3126_phy_create(adapter_t *adapter,
>                         int phy_addr, struct mdio_ops *mdio_ops)
> {
>         struct cphy *cphy = kzalloc(sizeof (*cphy), GFP_KERNEL);
>
>         if (cphy)
>                 cphy_init(cphy, adapter, phy_addr, &my3126_ops, mdio_ops);
>
>         INIT_WORK(&cphy->phy_update, my3216_poll, cphy);
>         cphy->bmsr = 0;
>
>         return (cphy);
> }
> ...
>
> <--  snip  -->
>
> It doesn't make sense to first check whether "cphy" is NULL and
> dereference it unconditionally later.
>

How about simply changing
         if (cphy)
                 cphy_init(cphy, adapter, phy_addr, &my3126_ops, mdio_ops);
into
         if (!cphy)
                 return NULL;

callers need to be able to handle that ofcourse, but I haven't checked that yet.

-- 
Jesper Juhl <jesper.juhl@...il.com>
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