staging: ks7010: move WPA code to separate function

Checkpatch emits WARNING: Too many leading tabs - consider code
refactoring. Function contains 5 levels of nesting and 14 local
variables. Code can be simplified and nesting reduced by refactoring
into separate functions.

WPA code is contained and may be factored out into a separate
function. This will reduce the length and complexity of
hostif_data_indication(). At times within the WPA code errors result
in the function returning. In order to maintain this behaviour new
function should return a status integer.

Factor out WPA code into separate function. Add only code needed to
get compilation to pass, including modifying return statements. Make
no other code changes, program logic is unchanged.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ks7010/ks_hostif.c

@@ -307,6 +307,99 @@ int get_ap_information(struct ks_wlan_private *priv, struct ap_info_t *ap_info,
 	return 0;
 }
 
+static
+int hostif_data_indication_wpa(struct ks_wlan_private *priv,
+			       unsigned short auth_type)
+{
+	struct ether_hdr *eth_hdr;
+	unsigned short eth_proto;
+	unsigned char RecvMIC[8];
+	char buf[128];
+	unsigned long now;
+	struct mic_failure_t *mic_failure;
+	struct michel_mic_t michel_mic;
+	union iwreq_data wrqu;
+
+	eth_hdr = (struct ether_hdr *)(priv->rxp);
+	eth_proto = ntohs(eth_hdr->h_proto);
+
+	if (memcmp(&eth_hdr->h_source[0], &priv->eth_addr[0], ETH_ALEN)) {	/* source address check */
+		if (eth_hdr->h_dest_snap != eth_hdr->h_source_snap) {
+			DPRINTK(1, "invalid data format\n");
+			priv->nstats.rx_errors++;
+			return -EINVAL;
+		}
+		if (((auth_type == TYPE_PMK1
+					&& priv->wpa.pairwise_suite ==
+					IW_AUTH_CIPHER_TKIP) || (auth_type == TYPE_GMK1
+								&& priv->wpa.
+								group_suite ==
+								IW_AUTH_CIPHER_TKIP)
+				|| (auth_type == TYPE_GMK2
+					&& priv->wpa.group_suite ==
+					IW_AUTH_CIPHER_TKIP))
+			&& priv->wpa.key[auth_type - 1].key_len) {
+			DPRINTK(4, "TKIP: protocol=%04X: size=%u\n",
+				eth_proto, priv->rx_size);
+			/* MIC save */
+			memcpy(&RecvMIC[0],
+				(priv->rxp) + ((priv->rx_size) - 8), 8);
+			priv->rx_size = priv->rx_size - 8;
+			if (auth_type > 0 && auth_type < 4) {	/* auth_type check */
+				MichaelMICFunction(&michel_mic, (uint8_t *)priv->wpa.key[auth_type - 1].rx_mic_key, (uint8_t *)priv->rxp, (int)priv->rx_size, (uint8_t)0,	/* priority */
+						(uint8_t *)michel_mic.Result);
+			}
+			if (memcmp(michel_mic.Result, RecvMIC, 8)) {
+				now = jiffies;
+				mic_failure = &priv->wpa.mic_failure;
+				/* MIC FAILURE */
+				if (mic_failure->last_failure_time &&
+					(now -
+						mic_failure->last_failure_time) /
+					HZ >= 60) {
+					mic_failure->failure = 0;
+				}
+				DPRINTK(4, "MIC FAILURE\n");
+				if (mic_failure->failure == 0) {
+					mic_failure->failure = 1;
+					mic_failure->counter = 0;
+				} else if (mic_failure->failure == 1) {
+					mic_failure->failure = 2;
+					mic_failure->counter =
+						(uint16_t)((now -
+								mic_failure->
+								last_failure_time)
+							/ HZ);
+					if (!mic_failure->counter)	/* mic_failure counter value range 1-60 */
+						mic_failure->counter =
+							1;
+				}
+				priv->wpa.mic_failure.
+					last_failure_time = now;
+				/*  needed parameters: count, keyid, key type, TSC */
+				sprintf(buf,
+					"MLME-MICHAELMICFAILURE.indication(keyid=%d %scast addr="
+					"%pM)",
+					auth_type - 1,
+					eth_hdr->
+					h_dest[0] & 0x01 ? "broad" :
+					"uni", eth_hdr->h_source);
+				memset(&wrqu, 0, sizeof(wrqu));
+				wrqu.data.length = strlen(buf);
+				DPRINTK(4,
+					"IWEVENT:MICHAELMICFAILURE\n");
+				wireless_send_event(priv->net_dev,
+						IWEVCUSTOM, &wrqu,
+						buf);
+				return -EINVAL;
+
+			}
+		}
+	}
+	return 0;
+}
+
+
 static
 void hostif_data_indication(struct ks_wlan_private *priv)
 {
@@ -314,17 +407,11 @@ void hostif_data_indication(struct ks_wlan_private *priv)
 	struct sk_buff *skb;
 	unsigned short auth_type;
 	unsigned char temp[256];
-
-	unsigned char RecvMIC[8];
-	char buf[128];
 	struct ether_hdr *eth_hdr;
 	unsigned short eth_proto;
-	unsigned long now;
-	struct mic_failure_t *mic_failure;
 	struct ieee802_1x_hdr *aa1x_hdr;
 	struct wpa_eapol_key *eap_key;
-	struct michel_mic_t michel_mic;
-	union iwreq_data wrqu;
+	int rc;
 
 	DPRINTK(3, "\n");
 
@@ -356,78 +443,9 @@ void hostif_data_indication(struct ks_wlan_private *priv)
 
 	/*  for WPA */
 	if (auth_type != TYPE_DATA && priv->wpa.rsn_enabled) {
-		if (memcmp(&eth_hdr->h_source[0], &priv->eth_addr[0], ETH_ALEN)) {	/* source address check */
-			if (eth_hdr->h_dest_snap != eth_hdr->h_source_snap) {
-				DPRINTK(1, "invalid data format\n");
-				priv->nstats.rx_errors++;
-				return;
-			}
-			if (((auth_type == TYPE_PMK1
-			      && priv->wpa.pairwise_suite ==
-			      IW_AUTH_CIPHER_TKIP) || (auth_type == TYPE_GMK1
-						       && priv->wpa.
-						       group_suite ==
-						       IW_AUTH_CIPHER_TKIP)
-			     || (auth_type == TYPE_GMK2
-				 && priv->wpa.group_suite ==
-				 IW_AUTH_CIPHER_TKIP))
-			    && priv->wpa.key[auth_type - 1].key_len) {
-				DPRINTK(4, "TKIP: protocol=%04X: size=%u\n",
-					eth_proto, priv->rx_size);
-				/* MIC save */
-				memcpy(&RecvMIC[0],
-				       (priv->rxp) + ((priv->rx_size) - 8), 8);
-				priv->rx_size = priv->rx_size - 8;
-				if (auth_type > 0 && auth_type < 4) {	/* auth_type check */
-					MichaelMICFunction(&michel_mic, (uint8_t *)priv->wpa.key[auth_type - 1].rx_mic_key, (uint8_t *)priv->rxp, (int)priv->rx_size, (uint8_t)0,	/* priority */
-							   (uint8_t *)michel_mic.Result);
-				}
-				if (memcmp(michel_mic.Result, RecvMIC, 8)) {
-					now = jiffies;
-					mic_failure = &priv->wpa.mic_failure;
-					/* MIC FAILURE */
-					if (mic_failure->last_failure_time &&
-					    (now -
-					     mic_failure->last_failure_time) /
-					    HZ >= 60) {
-						mic_failure->failure = 0;
-					}
-					DPRINTK(4, "MIC FAILURE\n");
-					if (mic_failure->failure == 0) {
-						mic_failure->failure = 1;
-						mic_failure->counter = 0;
-					} else if (mic_failure->failure == 1) {
-						mic_failure->failure = 2;
-						mic_failure->counter =
-						    (uint16_t)((now -
-								 mic_failure->
-								 last_failure_time)
-								/ HZ);
-						if (!mic_failure->counter)	/* mic_failure counter value range 1-60 */
-							mic_failure->counter =
-							    1;
-					}
-					priv->wpa.mic_failure.
-					    last_failure_time = now;
-					/*  needed parameters: count, keyid, key type, TSC */
-					sprintf(buf,
-						"MLME-MICHAELMICFAILURE.indication(keyid=%d %scast addr="
-						"%pM)",
-						auth_type - 1,
-						eth_hdr->
-						h_dest[0] & 0x01 ? "broad" :
-						"uni", eth_hdr->h_source);
-					memset(&wrqu, 0, sizeof(wrqu));
-					wrqu.data.length = strlen(buf);
-					DPRINTK(4,
-						"IWEVENT:MICHAELMICFAILURE\n");
-					wireless_send_event(priv->net_dev,
-							    IWEVCUSTOM, &wrqu,
-							    buf);
-					return;
-				}
-			}
-		}
+		rc = hostif_data_indication_wpa(priv, auth_type);
+		if (rc)
+			return;
 	}
 
 	if ((priv->connect_status & FORCE_DISCONNECT) ||