netdev - Re: [Patch] Scm: Remove unnecessary pid & credential references in Unix socket's send and receive path

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Date:	Thu, 18 Aug 2011 22:04:32 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	tim.c.chen@...ux.intel.com
Cc:	eric.dumazet@...il.com, viro@...iv.linux.org.uk,
	ebiederm@...ssion.com, ak@...ux.intel.com,
	matt.fleming@...ux.intel.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [Patch] Scm: Remove unnecessary pid & credential references in
 Unix socket's send and receive path

From: Tim Chen <tim.c.chen@...ux.intel.com>
Date: Wed, 17 Aug 2011 16:56:14 -0700

> +static __inline__ void scm_release(struct scm_cookie *scm)
> +{
> +	/* keep ref on pid and cred */
> +	scm->pid = NULL;
> +	scm->cred = NULL;
> +	if (scm && scm->fp)
> +		__scm_destroy(scm);
> +}

After dereferencing scm-> already, it seems a big redundant to test
it subsequently against NULL.
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