staging: rtl8712: r8712_joinbss_cmd(): Change return values and type

Change return values of function r8712_joinbss_cmd from _SUCCESS/_FAIL
to 0/-ENOMEM respectively.
Change return type from u8 to int to accommodate return of -ENOMEM.

Similarly, change the return values (_SUCCESS to 0 and _FAIL to -ENOMEM
or -EINVAL) and type (sint to int) of the call site of r8712_joinbss_cmd,
r8712_select_and_join_from_scan, as one of the branches of
r8712_select_and_join_from_scan directly returns the return value of
r8712_joinbss_cmd.

Modify the call sites of r8712_select_and_join_from_scan to check for
0 instead of _SUCCESS.

Issue found with Coccinelle.
Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8712/rtl871x_cmd.c

@@ -434,7 +434,7 @@ int r8712_createbss_cmd(struct _adapter *padapter)
 	return 0;
 }
 
-u8 r8712_joinbss_cmd(struct _adapter  *padapter, struct wlan_network *pnetwork)
+int r8712_joinbss_cmd(struct _adapter  *padapter, struct wlan_network *pnetwork)
 {
 	struct wlan_bssid_ex *psecnetwork;
 	struct cmd_obj		*pcmd;
@@ -449,7 +449,7 @@ u8 r8712_joinbss_cmd(struct _adapter  *padapter, struct wlan_network *pnetwork)
 	padapter->ledpriv.LedControlHandler(padapter, LED_CTL_START_TO_LINK);
 	pcmd = kmalloc(sizeof(*pcmd), GFP_ATOMIC);
 	if (!pcmd)
-		return _FAIL;
+		return -ENOMEM;
 
 	/* for hidden ap to set fw_state here */
 	if (check_fwstate(pmlmepriv, WIFI_STATION_STATE | WIFI_ADHOC_STATE) !=
@@ -566,7 +566,7 @@ u8 r8712_joinbss_cmd(struct _adapter  *padapter, struct wlan_network *pnetwork)
 	pcmd->rsp = NULL;
 	pcmd->rspsz = 0;
 	r8712_enqueue_cmd(pcmdpriv, pcmd);
-	return _SUCCESS;
+	return 0;
 }
 
 u8 r8712_disassoc_cmd(struct _adapter *padapter) /* for sta_mode */

drivers/staging/rtl8712/rtl871x_cmd.h

@@ -714,7 +714,7 @@ u8 r8712_sitesurvey_cmd(struct _adapter *padapter,
 			struct ndis_802_11_ssid *pssid);
 int r8712_createbss_cmd(struct _adapter *padapter);
 u8 r8712_setstakey_cmd(struct _adapter *padapter, u8 *psta, u8 unicast_key);
-u8 r8712_joinbss_cmd(struct _adapter *padapter,
+int r8712_joinbss_cmd(struct _adapter *padapter,
 		      struct wlan_network *pnetwork);
 u8 r8712_disassoc_cmd(struct _adapter *padapter);
 u8 r8712_setopmode_cmd(struct _adapter *padapter,

drivers/staging/rtl8712/rtl871x_ioctl_set.c

@@ -66,7 +66,7 @@ static u8 do_join(struct _adapter *padapter)
 	}
 
 	ret = r8712_select_and_join_from_scan(pmlmepriv);
-	if (ret == _SUCCESS) {
+	if (!ret) {
 		mod_timer(&pmlmepriv->assoc_timer,
 			  jiffies + msecs_to_jiffies(MAX_JOIN_TIMEOUT));
 	} else {

drivers/staging/rtl8712/rtl871x_mlme.c

@@ -548,8 +548,7 @@ void r8712_surveydone_event_callback(struct _adapter *adapter, u8 *pbuf)
 			if (!check_fwstate(pmlmepriv, _FW_LINKED)) {
 				set_fwstate(pmlmepriv, _FW_UNDER_LINKING);
 
-				if (r8712_select_and_join_from_scan(pmlmepriv)
-				    == _SUCCESS) {
+				if (!r8712_select_and_join_from_scan(pmlmepriv)) {
 					mod_timer(&pmlmepriv->assoc_timer, jiffies +
 						  msecs_to_jiffies(MAX_JOIN_TIMEOUT));
 				} else {
@@ -574,8 +573,7 @@ void r8712_surveydone_event_callback(struct _adapter *adapter, u8 *pbuf)
 		} else {
 			pmlmepriv->to_join = false;
 			set_fwstate(pmlmepriv, _FW_UNDER_LINKING);
-			if (r8712_select_and_join_from_scan(pmlmepriv) ==
-			    _SUCCESS)
+			if (!r8712_select_and_join_from_scan(pmlmepriv))
 				mod_timer(&pmlmepriv->assoc_timer, jiffies +
 					  msecs_to_jiffies(MAX_JOIN_TIMEOUT));
 			else
@@ -1106,7 +1104,7 @@ int r8712_select_and_join_from_scan(struct mlme_priv *pmlmepriv)
 				pnetwork = pnetwork_max_rssi;
 				goto ask_for_joinbss;
 			}
-			return _FAIL;
+			return -EINVAL;
 		}
 		pnetwork = container_of(pmlmepriv->pscanned,
 					struct wlan_network, list);

drivers/staging/rtl8712/rtl871x_mlme.h

@@ -172,7 +172,7 @@ void r8712_wpspbc_event_callback(struct _adapter *adapter, u8 *pbuf);
 void r8712_free_network_queue(struct _adapter *adapter);
 int r8712_init_mlme_priv(struct _adapter *adapter);
 void r8712_free_mlme_priv(struct mlme_priv *pmlmepriv);
-sint r8712_select_and_join_from_scan(struct mlme_priv *pmlmepriv);
+int r8712_select_and_join_from_scan(struct mlme_priv *pmlmepriv);
 sint r8712_set_key(struct _adapter *adapter,
 		   struct security_priv *psecuritypriv, sint keyid);
 sint r8712_set_auth(struct _adapter *adapter,