netdev - Re: [PATCH] mac80211: Do not use sizeof() on pointer type

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Date:	Wed, 26 Aug 2015 22:23:23 +0200
From:	Arend van Spriel <arend@...adcom.com>
To:	Thierry Reding <thierry.reding@...il.com>,
	Johannes Berg <johannes@...solutions.net>
CC:	"David S. Miller" <davem@...emloft.net>,
	<linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mac80211: Do not use sizeof() on pointer type

On 08/26/2015 12:22 PM, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
>
> The rate_control_cap_mask() function takes a parameter mcs_mask, which
> GCC will take to be u8 * even though it was declared with a fixed size.
> This causes the following warning:
>
> 	net/mac80211/rate.c: In function 'rate_control_cap_mask':
> 	net/mac80211/rate.c:719:25: warning: 'sizeof' on array function parameter 'mcs_mask' will return size of 'u8 * {aka unsigned char *}' [-Wsizeof-array-argument]
> 	   for (i = 0; i < sizeof(mcs_mask); i++)
> 	                         ^
> 	net/mac80211/rate.c:684:10: note: declared here
> 	       u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
> 	          ^
>
> This can be easily fixed by using the IEEE80211_HT_MCS_MASK_LEN directly
> within the loop condition.

Or use ARRAY_SIZE(mcs_mask).

Regards,
Arend

> Signed-off-by: Thierry Reding <treding@...dia.com>
> ---
>   net/mac80211/rate.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
> index 9857693b91ec..9ce8883d5f44 100644
> --- a/net/mac80211/rate.c
> +++ b/net/mac80211/rate.c
> @@ -716,7 +716,7 @@ static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata,
>
>   		/* Filter out rates that the STA does not support */
>   		*mask &= sta->supp_rates[sband->band];
> -		for (i = 0; i < sizeof(mcs_mask); i++)
> +		for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
>   			mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i];
>
>   		sta_vht_cap = sta->vht_cap.vht_mcs.rx_mcs_map;
>

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