linux-kernel - Re: [PATCH] staging: fsl-mc/dpio: Fix incorrect comparison

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Date:   Thu, 28 Sep 2017 15:48:36 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Ioana Radulescu <ruxandra.radulescu@....com>
Cc:     gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        arnd@...db.de, stuyoder@...il.com, roy.pledge@....com,
        linux-kernel@...r.kernel.org, agraf@...e.de,
        bogdan.purcareata@....com, laurentiu.tudor@....com
Subject: Re: [PATCH] staging: fsl-mc/dpio: Fix incorrect comparison

On Wed, Sep 27, 2017 at 12:57:28PM -0500, Ioana Radulescu wrote:
> diff --git a/drivers/staging/fsl-mc/bus/dpio/dpio-service.c b/drivers/staging/fsl-mc/bus/dpio/dpio-service.c
> index f809682..26922fc 100644
> --- a/drivers/staging/fsl-mc/bus/dpio/dpio-service.c
> +++ b/drivers/staging/fsl-mc/bus/dpio/dpio-service.c
> @@ -76,7 +76,7 @@ static inline struct dpaa2_io *service_select_by_cpu(struct dpaa2_io *d,
>  	if (d)
>  		return d;
>  
> -	if (unlikely(cpu >= num_possible_cpus()))
> +	if (unlikely(cpu >= (int)num_possible_cpus()))


Drivers shouldn't use likely/unlikley.  Please write it more explicitly
like this:

	if (cpu != -1 && cpu >= num_possible_cpus())
		return NULL;

Same for the other one as well.

regards,
dan carpenter