On 04.09.2018 09:39, Ajay Singh wrote:
> Refactor the wilc_netdev_init() to cleanup the memory for error
> scenario and remove unnecessary 'dev' pointer check.
>
> Signed-off-by: Ajay Singh <ajay.kat...@microchip.com>
> ---
> drivers/staging/wilc1000/linux_wlan.c | 36
> ++++++++++++++++-------
> drivers/staging/wilc1000/wilc_wfi_cfgoperations.c | 6 +++-
> 2 files changed, 30 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/staging/wilc1000/linux_wlan.c
> b/drivers/staging/wilc1000/linux_wlan.c
> index d7d43fd..91a45a7 100644
> --- a/drivers/staging/wilc1000/linux_wlan.c
> +++ b/drivers/staging/wilc1000/linux_wlan.c
> @@ -1073,10 +1073,8 @@ int wilc_netdev_init(struct wilc **wilc, struct device
> *dev, int io_type,
> INIT_LIST_HEAD(&wl->rxq_head.list);
>
> wl->hif_workqueue = create_singlethread_workqueue("WILC_wq");
> - if (!wl->hif_workqueue) {
> - kfree(wl);
> - return -ENOMEM;
> - }
> + if (!wl->hif_workqueue)
> + goto free_wl;
>
> register_inetaddr_notifier(&g_dev_notifier);
>
> @@ -1085,7 +1083,7 @@ int wilc_netdev_init(struct wilc **wilc, struct device
> *dev, int io_type,
>
> ndev = alloc_etherdev(sizeof(struct wilc_vif));
> if (!ndev)
> - return -ENOMEM;
> + goto free_ndev;
>
> vif = netdev_priv(ndev);
> memset(vif, 0, sizeof(struct wilc_vif));
> @@ -1106,15 +1104,13 @@ int wilc_netdev_init(struct wilc **wilc, struct
> device *dev, int io_type,
> ndev->netdev_ops = &wilc_netdev_ops;
>
> wdev = wilc_create_wiphy(ndev, dev);
> -
> - if (dev)
> - SET_NETDEV_DEV(ndev, dev);
> -
> if (!wdev) {
> netdev_err(ndev, "Can't register WILC Wiphy\n");
> - return -1;
> + goto free_ndev;
> }
>
> + SET_NETDEV_DEV(ndev, dev);
> +
> vif->ndev->ieee80211_ptr = wdev;
> vif->ndev->ml_priv = vif;
> wdev->netdev = vif->ndev;
> @@ -1125,11 +1121,29 @@ int wilc_netdev_init(struct wilc **wilc, struct
> device *dev, int io_type,
>
> ret = register_netdev(ndev);
> if (ret)
> - return ret;
> + goto free_ndev;
In case this happens you will loose the return code of register_netdev()
and you will return instead -ENOMEM. Maybe, the best approach will be to
initialize ret = -ENOMEM while declaring it
>
> vif->iftype = STATION_MODE;
> vif->mac_opened = 0;
> }
>
> return 0;
> +
> +free_ndev:
> + for (; i >= 0; i--) {
> + if (wl->vif[i]) {
> + if (wl->vif[i]->iftype == STATION_MODE)
> + unregister_netdev(wl->vif[i]->ndev);
> +
> + if (wl->vif[i]->ndev) {
> + wilc_free_wiphy(wl->vif[i]->ndev);
> + free_netdev(wl->vif[i]->ndev);
> + }
> + }
> + }
> + unregister_inetaddr_notifier(&g_dev_notifier);
> + destroy_workqueue(wl->hif_workqueue);
> +free_wl:
> + kfree(wl);
> + return -ENOMEM;
and here to just return ret.
> }
> diff --git a/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c
> b/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c
> index d103dce2..37c26d4 100644
> --- a/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c
> +++ b/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c
> @@ -2145,8 +2145,12 @@ struct wireless_dev *wilc_create_wiphy(struct
> net_device *net,
> set_wiphy_dev(wdev->wiphy, dev);
>
> ret = wiphy_register(wdev->wiphy);
> - if (ret)
> + if (ret) {
> netdev_err(net, "Cannot register wiphy device\n");
> + wiphy_free(wdev->wiphy);
> + kfree(wdev);
> + return NULL;
> + }
>
> priv->dev = net;
> return wdev;
>
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