mac80211: dissolve pre-rx handlers

These handlers do not really return a status and the compiler
can do a much better job when they're simply static functions
that it can inline if appropriate. Also makes the code shorter.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 37 insertions, 62 deletions

diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index f8e734f0da1a..3961d4c4320c 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -1407,7 +1407,6 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
         local->hw.queues = 1; /* default */
 
         local->mdev = mdev;
-        local->rx_pre_handlers = ieee80211_rx_pre_handlers;
         local->rx_handlers = ieee80211_rx_handlers;
         local->tx_handlers = ieee80211_tx_handlers;
 
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index cfd0717c0033..9d09ba8cc02b 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -480,7 +480,6 @@ struct ieee80211_local {
                              * deliver multicast frames both back to wireless
                              * media and to the local net stack */
 
-        ieee80211_rx_handler *rx_pre_handlers;
         ieee80211_rx_handler *rx_handlers;
         ieee80211_tx_handler *tx_handlers;
 
@@ -816,7 +815,6 @@ void ieee80211_regdomain_init(void);
 void ieee80211_set_default_regdomain(struct ieee80211_hw_mode *mode);
 
 /* rx handling */
-extern ieee80211_rx_handler ieee80211_rx_pre_handlers[];
 extern ieee80211_rx_handler ieee80211_rx_handlers[];
 
 /* tx handling */
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 535407d07fa4..3aae8e9e4e0a 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -249,15 +249,7 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
 }
 
 
-/* pre-rx handlers
- *
- * these don't have dev/sdata fields in the rx data
- * The sta value should also not be used because it may
- * be NULL even though a STA (in IBSS mode) will be added.
- */
-
-static ieee80211_txrx_result
-ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
+static void ieee80211_parse_qos(struct ieee80211_txrx_data *rx)
 {
         u8 *data = rx->skb->data;
         int tid;
@@ -290,8 +282,40 @@ ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
          * For now, set skb->priority to 0 for other cases. */
         rx->skb->priority = (tid > 7) ? 0 : tid;
+}
 
-        return TXRX_CONTINUE;
+static void ieee80211_verify_ip_alignment(struct ieee80211_txrx_data *rx)
+{
+#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
+        int hdrlen;
+
+        if (!WLAN_FC_DATA_PRESENT(rx->fc))
+                return;
+
+        /*
+         * Drivers are required to align the payload data in a way that
+         * guarantees that the contained IP header is aligned to a four-
+         * byte boundary. In the case of regular frames, this simply means
+         * aligning the payload to a four-byte boundary (because either
+         * the IP header is directly contained, or IV/RFC1042 headers that
+         * have a length divisible by four are in front of it.
+         *
+         * With A-MSDU frames, however, the payload data address must
+         * yield two modulo four because there are 14-byte 802.3 headers
+         * within the A-MSDU frames that push the IP header further back
+         * to a multiple of four again. Thankfully, the specs were sane
+         * enough this time around to require padding each A-MSDU subframe
+         * to a length that is a multiple of four.
+         *
+         * Padding like atheros hardware adds which is inbetween the 802.11
+         * header and the payload is not supported, the driver is required
+         * to move the 802.11 header further back in that case.
+         */
+        hdrlen = ieee80211_get_hdrlen(rx->fc);
+        if (rx->flags & IEEE80211_TXRXD_RX_AMSDU)
+                hdrlen += ETH_HLEN;
+        WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
+#endif
 }
 
 
@@ -340,52 +364,6 @@ static u32 ieee80211_rx_load_stats(struct ieee80211_local *local,
         return load;
 }
 
-#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
-static ieee80211_txrx_result
-ieee80211_rx_h_verify_ip_alignment(struct ieee80211_txrx_data *rx)
-{
-        int hdrlen;
-
-        if (!WLAN_FC_DATA_PRESENT(rx->fc))
-                return TXRX_CONTINUE;
-
-        /*
-         * Drivers are required to align the payload data in a way that
-         * guarantees that the contained IP header is aligned to a four-
-         * byte boundary. In the case of regular frames, this simply means
-         * aligning the payload to a four-byte boundary (because either
-         * the IP header is directly contained, or IV/RFC1042 headers that
-         * have a length divisible by four are in front of it.
-         *
-         * With A-MSDU frames, however, the payload data address must
-         * yield two modulo four because there are 14-byte 802.3 headers
-         * within the A-MSDU frames that push the IP header further back
-         * to a multiple of four again. Thankfully, the specs were sane
-         * enough this time around to require padding each A-MSDU subframe
-         * to a length that is a multiple of four.
-         *
-         * Padding like atheros hardware adds which is inbetween the 802.11
-         * header and the payload is not supported, the driver is required
-         * to move the 802.11 header further back in that case.
-         */
-        hdrlen = ieee80211_get_hdrlen(rx->fc);
-        if (rx->flags & IEEE80211_TXRXD_RX_AMSDU)
-                hdrlen += ETH_HLEN;
-        WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
-
-        return TXRX_CONTINUE;
-}
-#endif
-
-ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
-{
-        ieee80211_rx_h_parse_qos,
-#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
-        ieee80211_rx_h_verify_ip_alignment,
-#endif
-        NULL
-};
-
 /* rx handlers */
 
 static ieee80211_txrx_result
@@ -1747,9 +1725,9 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
         if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
                 rx.flags |= IEEE80211_TXRXD_RXIN_SCAN;
 
-        if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
-                                           sta) != TXRX_CONTINUE)
-                goto end;
+        ieee80211_parse_qos(&rx);
+        ieee80211_verify_ip_alignment(&rx);
+
         skb = rx.skb;
 
         if (sta && !(sta->flags & (WLAN_STA_WDS | WLAN_STA_ASSOC_AP)) &&