wl1271: Clean up TX security sequence number handling

Instead of managing the TX security sequence number as two variables, use
one 64 bit variable. This greatly simplifies the handling of the number.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Teemu Paasikivi <ext-teemu.3.paasikivi@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 12 insertions, 18 deletions

diff --git a/drivers/net/wireless/wl12xx/wl1271.h b/drivers/net/wireless/wl12xx/wl1271.h
index 41de47caa201..0deb4fdf916b 100644
--- a/drivers/net/wireless/wl12xx/wl1271.h
+++ b/drivers/net/wireless/wl12xx/wl1271.h
@@ -110,6 +110,9 @@ enum {
 #define WL1271_FW_NAME "wl1271-fw.bin"
 #define WL1271_NVS_NAME "wl1271-nvs.bin"
 
+#define WL1271_TX_SECURITY_LO16(s) ((u16)((s) & 0xffff))
+#define WL1271_TX_SECURITY_HI32(s) ((u32)(((s) >> 16) & 0xffffffff))
+
 /* NVS data structure */
 #define WL1271_NVS_SECTION_SIZE                  468
 
@@ -419,8 +422,7 @@ struct wl1271 {
 
         /* Security sequence number counters */
         u8 tx_security_last_seq;
-        u16 tx_security_seq_16;
-        u32 tx_security_seq_32;
+        s64 tx_security_seq;
 
         /* FW Rx counter */
         u32 rx_counter;
diff --git a/drivers/net/wireless/wl12xx/wl1271_cmd.c b/drivers/net/wireless/wl12xx/wl1271_cmd.c
index e029bf03809d..d59b3830a6a5 100644
--- a/drivers/net/wireless/wl12xx/wl1271_cmd.c
+++ b/drivers/net/wireless/wl12xx/wl1271_cmd.c
@@ -318,8 +318,7 @@ int wl1271_cmd_join(struct wl1271 *wl, u8 bss_type)
 
         /* reset TX security counters */
         wl->tx_security_last_seq = 0;
-        wl->tx_security_seq_16 = 0;
-        wl->tx_security_seq_32 = 0;
+        wl->tx_security_seq = 0;
 
         ret = wl1271_cmd_send(wl, CMD_START_JOIN, join, sizeof(*join), 0);
         if (ret < 0) {
diff --git a/drivers/net/wireless/wl12xx/wl1271_main.c b/drivers/net/wireless/wl12xx/wl1271_main.c
index 4c4d22acaeea..f10ba847689d 100644
--- a/drivers/net/wireless/wl12xx/wl1271_main.c
+++ b/drivers/net/wireless/wl12xx/wl1271_main.c
@@ -1020,8 +1020,7 @@ static void wl1271_op_stop(struct ieee80211_hw *hw)
         wl->tx_results_count = 0;
         wl->tx_packets_count = 0;
         wl->tx_security_last_seq = 0;
-        wl->tx_security_seq_16 = 0;
-        wl->tx_security_seq_32 = 0;
+        wl->tx_security_seq = 0;
         wl->time_offset = 0;
         wl->session_counter = 0;
         wl->rate_set = CONF_TX_RATE_MASK_BASIC;
@@ -1428,15 +1427,15 @@ static int wl1271_op_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                 key_type = KEY_TKIP;
 
                 key_conf->hw_key_idx = key_conf->keyidx;
-                tx_seq_32 = wl->tx_security_seq_32;
-                tx_seq_16 = wl->tx_security_seq_16;
+                tx_seq_32 = WL1271_TX_SECURITY_HI32(wl->tx_security_seq);
+                tx_seq_16 = WL1271_TX_SECURITY_LO16(wl->tx_security_seq);
                 break;
         case ALG_CCMP:
                 key_type = KEY_AES;
 
                 key_conf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
-                tx_seq_32 = wl->tx_security_seq_32;
-                tx_seq_16 = wl->tx_security_seq_16;
+                tx_seq_32 = WL1271_TX_SECURITY_HI32(wl->tx_security_seq);
+                tx_seq_16 = WL1271_TX_SECURITY_LO16(wl->tx_security_seq);
                 break;
         default:
                 wl1271_error("Unknown key algo 0x%x", key_conf->alg);
diff --git a/drivers/net/wireless/wl12xx/wl1271_tx.c b/drivers/net/wireless/wl12xx/wl1271_tx.c
index d3ed63e92cf4..1b11e2caabd6 100644
--- a/drivers/net/wireless/wl12xx/wl1271_tx.c
+++ b/drivers/net/wireless/wl12xx/wl1271_tx.c
@@ -303,7 +303,6 @@ static void wl1271_tx_complete_packet(struct wl1271 *wl,
 {
         struct ieee80211_tx_info *info;
         struct sk_buff *skb;
-        u16 seq;
         int id = result->id;
 
         /* check for id legality */
@@ -331,15 +330,10 @@ static void wl1271_tx_complete_packet(struct wl1271 *wl,
         wl->stats.retry_count += result->ack_failures;
 
         /* update security sequence number */
-        seq = wl->tx_security_seq_16 +
-                (result->lsb_security_sequence_number -
-                 wl->tx_security_last_seq);
+        wl->tx_security_seq += (result->lsb_security_sequence_number -
+                                wl->tx_security_last_seq);
         wl->tx_security_last_seq = result->lsb_security_sequence_number;
 
-        if (seq < wl->tx_security_seq_16)
-                wl->tx_security_seq_32++;
-        wl->tx_security_seq_16 = seq;
-
         /* remove private header from packet */
         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));