[PATCH] mwifiex: scan: Simplify code

[PATCH] mwifiex: scan: Simplify code

[Christophe JAILLET]

This patch:
   - improves code layout
   - removes a useless memset(0) for some memory allocated with kzalloc
   - removes a useless if. We know that 'if (chan_band_tlv)' will succeed
     because it has been tested a few lines above

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
 drivers/net/wireless/marvell/mwifiex/scan.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c
index 21ec84794d0c..c29dd958acae 100644
--- a/drivers/net/wireless/marvell/mwifiex/scan.c
+++ b/drivers/net/wireless/marvell/mwifiex/scan.c
@@ -2179,18 +2179,14 @@ int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
 
 		if (chan_band_tlv && adapter->nd_info) {
 			adapter->nd_info->matches[idx] =
-				kzalloc(sizeof(*pmatch) +
-				sizeof(u32), GFP_ATOMIC);
+				kzalloc(sizeof(*pmatch) + sizeof(u32),
+					GFP_ATOMIC);
 
 			pmatch = adapter->nd_info->matches[idx];
 
 			if (pmatch) {
-				memset(pmatch, 0, sizeof(*pmatch));
-				if (chan_band_tlv) {
-					pmatch->n_channels = 1;
-					pmatch->channels[0] =
-						chan_band->chan_number;
-				}
+				pmatch->n_channels = 1;
+				pmatch->channels[0] = chan_band->chan_number;
 			}
 		}
 
-- 
2.7.4

Re: [PATCH] mwifiex: scan: Simplify code

[Joe Perches]

On Wed, 2016-08-31 at 13:50 +0200, Christophe JAILLET wrote:
> This patch:
>    - improves code layout
>    - removes a useless memset(0) for some memory allocated with kzalloc
>    - removes a useless if. We know that 'if (chan_band_tlv)' will succeed
>      because it has been tested a few lines above

True, the code above it is also confusing as it's

#ifdef CONFIG_PM
	if (priv->wdev.wiphy->wowlan_config)
		nd_config = priv->wdev.wiphy->wowlan_config->nd_config;
#endif

	if (nd_config) {
		adapter->nd_info =
			kzalloc(sizeof(struct cfg80211_wowlan_nd_match) +
				sizeof(struct cfg80211_wowlan_nd_match *) *
				scan_rsp->number_of_sets, GFP_ATOMIC);

		if (adapter->nd_info)
			adapter->nd_info->n_matches = scan_rsp->number_of_sets;
	}
where nd_config is a pointer already initialized to NULL
so the #endif seems misplaced.

> diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c
[]
> @@ -2179,18 +2179,14 @@ int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,

>  
>  		if (chan_band_tlv && adapter->nd_info) {
>  			adapter->nd_info->matches[idx] =
> -				kzalloc(sizeof(*pmatch) +
> -				sizeof(u32), GFP_ATOMIC);
> +				kzalloc(sizeof(*pmatch) + sizeof(u32),
> +					GFP_ATOMIC);
>  
>  			pmatch = adapter->nd_info->matches[idx];
>  
>  			if (pmatch) {
> -				memset(pmatch, 0, sizeof(*pmatch));
> -				if (chan_band_tlv) {
> -					pmatch->n_channels = 1;
> -					pmatch->channels[0] =
> -						chan_band->chan_number;
> -				}
> +				pmatch->n_channels = 1;
> +				pmatch->channels[0] = chan_band->chan_number;
>  			}
>  		}

Maybe it'd be better to move the pmatch declaration to this block
and alloc to pmatch then assign adapter->nd_info->matches[idx]
later.

I think the #ifdef CONFIG_PM use in this routine is incomplete.

Re: mwifiex: scan: Simplify code

[Kalle Valo]

Christophe Jaillet <christophe.jaillet@wanadoo.fr> wrote:
> This patch:
>    - improves code layout
>    - removes a useless memset(0) for some memory allocated with kzalloc
>    - removes a useless if. We know that 'if (chan_band_tlv)' will succeed
>      because it has been tested a few lines above
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

Thanks, 1 patch applied to wireless-drivers-next.git:

b71165761694 mwifiex: scan: Simplify code

-- 
Sent by pwcli
https://patchwork.kernel.org/patch/9307009/