Re: [PATCH 2/2] staging: wilc1000: One function call less in mac_ioctl() after error detection

Julia Lawall
2015-06-27T16:21:29Z

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

> From: Markus Elfring <elfring@users.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@users.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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