[PATCH] mwifiex: remove unnecessary call to memset

[PATCH] mwifiex: remove unnecessary call to memset

[Himanshu Jha]

call to memset to assign 0 value immediately after allocating
memory with kzalloc is unnecesaary as kzalloc allocates the memory
filled with 0 value.

Semantic patch used to resolve this issue:

@@
expression e,e2; constant c;
statement S;
@@

  e = kzalloc(e2, c);
  if(e == NULL) S
- memset(e, 0, e2);

Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com>
---
 drivers/net/wireless/marvell/mwifiex/scan.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c
index c9d41ed..8838b88 100644
--- a/drivers/net/wireless/marvell/mwifiex/scan.c
+++ b/drivers/net/wireless/marvell/mwifiex/scan.c
@@ -1936,8 +1936,6 @@ mwifiex_active_scan_req_for_passive_chan(struct mwifiex_private *priv)
 	if (!user_scan_cfg)
 		return -ENOMEM;
 
-	memset(user_scan_cfg, 0, sizeof(*user_scan_cfg));
-
 	for (id = 0; id < MWIFIEX_USER_SCAN_CHAN_MAX; id++) {
 		if (!priv->hidden_chan[id].chan_number)
 			break;
-- 
2.7.4

Re: mwifiex: remove unnecessary call to memset

[Kalle Valo]

Himanshu Jha <himanshujha199640-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> call to memset to assign 0 value immediately after allocating
> memory with kzalloc is unnecesaary as kzalloc allocates the memory
> filled with 0 value.
> 
> Semantic patch used to resolve this issue:
> 
> @@
> expression e,e2; constant c;
> statement S;
> @@
> 
>   e = kzalloc(e2, c);
>   if(e == NULL) S
> - memset(e, 0, e2);
> 
> Signed-off-by: Himanshu Jha <himanshujha199640-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Patch applied to wireless-drivers-next.git, thanks.

85dafc129196 mwifiex: remove unnecessary call to memset

-- 
https://patchwork.kernel.org/patch/9947331/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

RE: [PATCH] mwifiex: remove unnecessary call to memset

[Xinming Hu]

Hi Himanshu,


> -----Original Message-----
> From: Himanshu Jha [mailto:himanshujha199640@gmail.com]
> Sent: 2017年9月11日 20:46
> To: amitkarwar@gmail.com
> Cc: Nishant Sarmukadam <nishants@marvell.com>; Ganapathi Bhat
> <gbhat@marvell.com>; Xinming Hu <huxm@marvell.com>;
> kvalo@codeaurora.org; linux-wireless@vger.kernel.org;
> netdev@vger.kernel.org; Himanshu Jha <himanshujha199640@gmail.com>
> Subject: [EXT] [PATCH] mwifiex: remove unnecessary call to memset
> 
> External Email
> 
> ----------------------------------------------------------------------
> call to memset to assign 0 value immediately after allocating memory with
> kzalloc is unnecesaary as kzalloc allocates the memory filled with 0 value.
> 

Looks find to me, Thanks.

Regards,
Simon

> Semantic patch used to resolve this issue:
> 
> @@
> expression e,e2; constant c;
> statement S;
> @@
> 
>   e = kzalloc(e2, c);
>   if(e == NULL) S
> - memset(e, 0, e2);
> 
> Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com>
> ---
>  drivers/net/wireless/marvell/mwifiex/scan.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c
> b/drivers/net/wireless/marvell/mwifiex/scan.c
> index c9d41ed..8838b88 100644
> --- a/drivers/net/wireless/marvell/mwifiex/scan.c
> +++ b/drivers/net/wireless/marvell/mwifiex/scan.c
> @@ -1936,8 +1936,6 @@ mwifiex_active_scan_req_for_passive_chan(struct
> mwifiex_private *priv)
>  	if (!user_scan_cfg)
>  		return -ENOMEM;
> 
> -	memset(user_scan_cfg, 0, sizeof(*user_scan_cfg));
> -
>  	for (id = 0; id < MWIFIEX_USER_SCAN_CHAN_MAX; id++) {
>  		if (!priv->hidden_chan[id].chan_number)
>  			break;
> --
> 2.7.4