linux-kernel - Re: [PATCH 5/5] wifi: mwifiex: use vmalloc

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Message-ID: <aJtGSxkRztAsy92h@stanley.mountain>
Date: Tue, 12 Aug 2025 16:48:59 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Qianfeng Rong <rongqianfeng@...o.com>
Cc: Brian Norris <briannorris@...omium.org>,
	Francesco Dolcini <francesco@...cini.it>,
	Johannes Berg <johannes.berg@...el.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Kalle Valo <kvalo@...nel.org>,
	Aditya Kumar Singh <quic_adisi@...cinc.com>,
	Rameshkumar Sundaram <quic_ramess@...cinc.com>,
	Roopni Devanathan <quic_rdevanat@...cinc.com>,
	"open list:MARVELL MWIFIEX WIRELESS DRIVER" <linux-wireless@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] wifi: mwifiex: use vmalloc_array() to simplify code

On Tue, Aug 12, 2025 at 09:32:18PM +0800, Qianfeng Rong wrote:
> Remove array_size() calls and replace vmalloc() with vmalloc_array() to
> simplify the code.
> 
> Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
> ---
>  drivers/net/wireless/marvell/mwifiex/cfg80211.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/marvell/mwifiex/cfg80211.c b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
> index 3498743d5ec0..fb4183ff02a9 100644
> --- a/drivers/net/wireless/marvell/mwifiex/cfg80211.c
> +++ b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
> @@ -4673,8 +4673,8 @@ int mwifiex_init_channel_scan_gap(struct mwifiex_adapter *adapter)
>  	 * additional active scan request for hidden SSIDs on passive channels.
>  	 */
>  	adapter->num_in_chan_stats = 2 * (n_channels_bg + n_channels_a);
> -	adapter->chan_stats = vmalloc(array_size(sizeof(*adapter->chan_stats),
> -						 adapter->num_in_chan_stats));
> +	adapter->chan_stats = vmalloc_array(adapter->num_in_chan_stats,
> +					    sizeof(*adapter->chan_stats));

n_channels_bg is 14
n_channels_a is either 0 or 31 depending on if we're using BAND_A.
sizeof(*adapter->chan_stats) is 10.

So we're either allocating 280 or 900 bytes, which is quite small.  We
should just use kmalloc_array() instead of vmalloc_array().

regards,
dan carpenter