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Date:   Wed, 09 Sep 2020 02:33:48 -0700
From:   Joe Perches <joe@...ches.com>
To:     Wei Xu <xuwei5@...ilicon.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, linuxarm@...wei.com,
        shameerali.kolothum.thodi@...wei.com, jonathan.cameron@...wei.com,
        john.garry@...wei.com, salil.mehta@...wei.com,
        shiju.jose@...wei.com, jinying@...ilicon.com,
        zhangyi.ac@...wei.com, liguozhu@...ilicon.com,
        tangkunshan@...wei.com, huangdaode@...ilicon.com,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Jakub Kicinski <kuba@...nel.org>,
        intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next] net: iavf: Use the ARRAY_SIZE macro for aq_to_posix

On Wed, 2020-09-09 at 16:51 +0800, Wei Xu wrote:
> Use the ARRAY_SIZE macro to calculate the size of an array.
> This code was detected with the help of Coccinelle.
[]
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_adminq.h b/drivers/net/ethernet/intel/iavf/iavf_adminq.h
[]
> @@ -120,7 +120,7 @@ static inline int iavf_aq_rc_to_posix(int aq_ret, int aq_rc)
>  	if (aq_ret == IAVF_ERR_ADMIN_QUEUE_TIMEOUT)
>  		return -EAGAIN;
>  
> -	if (!((u32)aq_rc < (sizeof(aq_to_posix) / sizeof((aq_to_posix)[0]))))
> +	if (!((u32)aq_rc < ARRAY_SIZE(aq_to_posix)))
>  		return -ERANGE;

If you want to use a cast,

	if ((u32)aq_rc >= ARRAY_SIZE(aq_to_posix))
		return -ERANGE;

would be a more common and simpler style, though
perhaps testing ac_rc < 0 would be more intelligible.

	if (ac_rc < 0 || ac_rq >= ARRAY_SIZE(aq_to_posix))
		return -ERANGE;



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