linux-kernel - Re: [PATCH 2/2] staging: wilc1000: One function call less in mac

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Date:	Sat, 27 Jun 2015 18:21:29 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:	Chris Park <chris.park@...el.com>, Dean Lee <dean.lee@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Johnny Kim <johnny.kim@...el.com>,
	Rachel Kim <rachel.kim@...el.com>,
	linux-wireless@...r.kernel.org, devel@...verdev.osuosl.org,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 2/2] staging: wilc1000: One function call less in
 mac_ioctl() after error detection



On Sat, 27 Jun 2015, SF Markus Elfring wrote:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sat, 27 Jun 2015 16:00:59 +0200
>
> The kfree() function was called in two cases by the mac_ioctl() function
> during error handling even if the passed variable did not contain a pointer
> for a valid data item.
>
> * This implementation detail could be improved by the introduction
>   of another jump label.
>
> * Drop an unnecessary initialisation for the variable "buff" then.
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/staging/wilc1000/linux_wlan.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/staging/wilc1000/linux_wlan.c b/drivers/staging/wilc1000/linux_wlan.c
> index 2aa8d9b..f492310 100644
> --- a/drivers/staging/wilc1000/linux_wlan.c
> +++ b/drivers/staging/wilc1000/linux_wlan.c
> @@ -2351,16 +2351,13 @@ int mac_close(struct net_device *ndev)
>
>  int mac_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
>  {
> -
> -	u8 *buff = NULL;
> +	u8 *buff;
>  	s8 rssi;
>  	u32 size = 0, length = 0;
>  	perInterface_wlan_t *nic;
>  	struct WILC_WFI_priv *priv;
>  	s32 s32Error = WILC_SUCCESS;
>
> -
> -

Removing these blank lines seems to have nothing to do with the topic of
the patch.

julia

>  	/* struct iwreq *wrq = (struct iwreq *) req;	// tony moved to case SIOCSIWPRIV */
>  	#ifdef USE_WIRELESS
>  	nic = netdev_priv(ndev);
> @@ -2405,7 +2402,7 @@ int mac_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
>  				if (copy_to_user(wrq->u.data.pointer, buff, size)) {
>  					PRINT_ER("%s: failed to copy data to user buffer\n", __func__);
>  					s32Error = -EFAULT;
> -					goto done;
> +					goto free_buffer;
>  				}
>  			}
>  		}
> @@ -2420,8 +2417,9 @@ int mac_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
>  	}
>  	}
>
> -done:
> +free_buffer:
>  	kfree(buff);
> +done:
>  	return s32Error;
>  }
>
> --
> 2.4.4
>
> --
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