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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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