linux-kernel - Re: [PATCH v3] staging: wlan-ng: replace rate macros

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Date:   Tue, 18 Apr 2023 15:04:06 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Luke Koch <lu.ale.koch@...il.com>
Cc:     error27@...il.com, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] staging: wlan-ng: replace rate macros

<note, your Reply-To: is very odd, please fix your email client up...>

On Tue, Apr 18, 2023 at 02:35:52PM +0200, Luke Koch wrote:
> Change p80211msg_dot11req_scan_results rate members to struct arrays
> instead of individually numbered member structs.
> Replace macros to set rates with loops to avoid checkpatch warning
> and adhere to linux coding style.
> 
> Reported by checkpatch:
> 
> CHECK: Macro argument reuse 'N' - possible side-effects?
> 
> Signed off by: Luke Koch <lu.ale.koch@...il.com>
> ---
> v2: - Fix array underflow and conditions with respect to the start at 0
> v3: - Remove unnecessary spaces
> ---
>  drivers/staging/wlan-ng/p80211metastruct.h | 18 +-------
>  drivers/staging/wlan-ng/prism2mgmt.c       | 52 +++++++---------------
>  2 files changed, 18 insertions(+), 52 deletions(-)
> 
> diff --git a/drivers/staging/wlan-ng/p80211metastruct.h b/drivers/staging/wlan-ng/p80211metastruct.h
> index 4adc64580185..e963227f797c 100644
> --- a/drivers/staging/wlan-ng/p80211metastruct.h
> +++ b/drivers/staging/wlan-ng/p80211metastruct.h
> @@ -114,22 +114,8 @@ struct p80211msg_dot11req_scan_results {
>  	struct p80211item_uint32 cfpollreq;
>  	struct p80211item_uint32 privacy;
>  	struct p80211item_uint32 capinfo;
> -	struct p80211item_uint32 basicrate1;
> -	struct p80211item_uint32 basicrate2;
> -	struct p80211item_uint32 basicrate3;
> -	struct p80211item_uint32 basicrate4;
> -	struct p80211item_uint32 basicrate5;
> -	struct p80211item_uint32 basicrate6;
> -	struct p80211item_uint32 basicrate7;
> -	struct p80211item_uint32 basicrate8;
> -	struct p80211item_uint32 supprate1;
> -	struct p80211item_uint32 supprate2;
> -	struct p80211item_uint32 supprate3;
> -	struct p80211item_uint32 supprate4;
> -	struct p80211item_uint32 supprate5;
> -	struct p80211item_uint32 supprate6;
> -	struct p80211item_uint32 supprate7;
> -	struct p80211item_uint32 supprate8;
> +	struct p80211item_uint32 basicrate[8];
> +	struct p80211item_uint32 supprate[8];
>  } __packed;
>  
>  struct p80211msg_dot11req_start {
> diff --git a/drivers/staging/wlan-ng/prism2mgmt.c b/drivers/staging/wlan-ng/prism2mgmt.c
> index 9030a8939a9b..fc465261baa1 100644
> --- a/drivers/staging/wlan-ng/prism2mgmt.c
> +++ b/drivers/staging/wlan-ng/prism2mgmt.c
> @@ -437,42 +437,22 @@ int prism2mgmt_scan_results(struct wlandevice *wlandev, void *msgp)
>  		if (item->supprates[count] == 0)
>  			break;
>  
> -#define REQBASICRATE(N) \
> -	do { \
> -		if ((count >= (N)) && DOT11_RATE5_ISBASIC_GET(	\
> -			item->supprates[(N) - 1])) { \
> -			req->basicrate ## N .data = item->supprates[(N) - 1]; \
> -			req->basicrate ## N .status = \
> -				P80211ENUM_msgitem_status_data_ok; \
> -		} \
> -	} while (0)
> -
> -	REQBASICRATE(1);
> -	REQBASICRATE(2);
> -	REQBASICRATE(3);
> -	REQBASICRATE(4);
> -	REQBASICRATE(5);
> -	REQBASICRATE(6);
> -	REQBASICRATE(7);
> -	REQBASICRATE(8);
> -
> -#define REQSUPPRATE(N) \
> -	do { \
> -		if (count >= (N)) {					\
> -			req->supprate ## N .data = item->supprates[(N) - 1]; \
> -			req->supprate ## N .status = \
> -				P80211ENUM_msgitem_status_data_ok; \
> -		} \
> -	} while (0)
> -
> -	REQSUPPRATE(1);
> -	REQSUPPRATE(2);
> -	REQSUPPRATE(3);
> -	REQSUPPRATE(4);
> -	REQSUPPRATE(5);
> -	REQSUPPRATE(6);
> -	REQSUPPRATE(7);
> -	REQSUPPRATE(8);
> +	for (int i = 0; i < 8; i++) {
> +		if (count > i &&
> +		    DOT11_RATE5_ISBASIC_GET(item->supprates[i])) {
> +			req->basicrate[i].data = item->supprates[i];
> +			req->basicrate[i].status =
> +				P80211ENUM_msgitem_status_data_ok;
> +		}
> +	}
> +
> +	for (int i = 0; i < 8; i++) {
> +		if (count > i) {
> +			req->supprate[i].data = item->supprates[i];
> +			req->supprate[i].status =
> +				P80211ENUM_msgitem_status_data_ok;
> +		}
> +	}

This patch implies that these structures are set but never actually read
from, so why are they present at all?  Is this a structure that is on
the wire/air or used somewhere else as an api to hardware?

I tried to unwind things in the driver, but couldn't figure it out, what
happens if you just delete these fields, does the driver still work
properly?

thanks,

greg k-h