linux-kernel - Re: [patch] tracing: checking for NULL instead of IS

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Date:	Mon, 25 Apr 2016 13:59:32 -0500
From:	Tom Zanussi <tom.zanussi@...ux.intel.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Steven Rostedt <rostedt@...dmis.org>
CC:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] tracing: checking for NULL instead of IS_ERR()

Hi Dan,

On 04/23/2016 05:23 AM, Dan Carpenter wrote:
> tracing_map_elt_alloc() returns ERR_PTRs on error, never NULL.
>
> Fixes: 08d43a5fa063 ('tracing: Add lock-free tracing_map')
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
>
> diff --git a/kernel/trace/tracing_map.c b/kernel/trace/tracing_map.c
> index e0f1729..e7dfc5e 100644
> --- a/kernel/trace/tracing_map.c
> +++ b/kernel/trace/tracing_map.c
> @@ -814,7 +814,7 @@ static struct tracing_map_elt *copy_elt(struct tracing_map_elt *elt)
>   	unsigned int i;
>
>   	dup_elt = tracing_map_elt_alloc(elt->map);
> -	if (!dup_elt)
> +	if (IS_ERR(dup_elt))
>   		return NULL;
>
>   	if (elt->map->ops && elt->map->ops->elt_copy)
>

Thanks for fixing this.  I found another one along the same lines which 
I'll send a patch for shortly.

Acked-by: Tom Zanussi <tom.zanussi@...ux.intel.com>