Revert "mac80211: Skip tailroom reservation for full HW-crypto devices"

This reverts commit aac6af5534fade2b18682a0b9efad1a6c04c34c6.

Conflicts:

	net/mac80211/key.c

That commit has a race that causes a warning, as documented in the thread
here:

	http://marc.info/?l=linux-wireless&m=130717684914101&w=2

Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 2025af5..090b0ec 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -775,9 +775,6 @@ struct ieee80211_local {
 
        int tx_headroom; /* required headroom for hardware/radiotap */
 
-       /* count for keys needing tailroom space allocation */
-       int crypto_tx_tailroom_needed_cnt;
-
        /* Tasklet and skb queue to process calls from IRQ mode. All frames
         * added to skb_queue will be processed, but frames in
         * skb_queue_unreliable may be dropped if the total length of these

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 31afd71..f825e2f 100644 (file)
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -101,11 +101,6 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 
        if (!ret) {
                key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
-
-               if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
-                     (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
-                       key->local->crypto_tx_tailroom_needed_cnt--;
-
                return 0;
        }
 
@@ -161,10 +156,6 @@ static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
                          key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
 
        key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
-
-       if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
-             (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
-               key->local->crypto_tx_tailroom_needed_cnt++;
 }
 
 void ieee80211_key_removed(struct ieee80211_key_conf *key_conf)
@@ -403,10 +394,8 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key)
                ieee80211_aes_key_free(key->u.ccmp.tfm);
        if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
                ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
-       if (key->local) {
+       if (key->local)
                ieee80211_debugfs_key_remove(key);
-               key->local->crypto_tx_tailroom_needed_cnt--;
-       }
 
        kfree(key);
 }
@@ -468,8 +457,6 @@ int ieee80211_key_link(struct ieee80211_key *key,
 
        ieee80211_debugfs_key_add(key);
 
-       key->local->crypto_tx_tailroom_needed_cnt++;
-
        ret = ieee80211_key_enable_hw_accel(key);
 
        mutex_unlock(&sdata->local->key_mtx);
@@ -511,12 +498,8 @@ void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 
        mutex_lock(&sdata->local->key_mtx);
 
-       sdata->local->crypto_tx_tailroom_needed_cnt = 0;
-
-       list_for_each_entry(key, &sdata->key_list, list) {
-               sdata->local->crypto_tx_tailroom_needed_cnt++;
+       list_for_each_entry(key, &sdata->key_list, list)
                ieee80211_key_enable_hw_accel(key);
-       }
 
        mutex_unlock(&sdata->local->key_mtx);
 }

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 64e0f75..3104c84 100644 (file)
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1480,7 +1480,12 @@ static int ieee80211_skb_resize(struct ieee80211_local *local,
 {
        int tail_need = 0;
 
-       if (may_encrypt && local->crypto_tx_tailroom_needed_cnt) {
+       /*
+        * This could be optimised, devices that do full hardware
+        * crypto (including TKIP MMIC) need no tailroom... But we
+        * have no drivers for such devices currently.
+        */
+       if (may_encrypt) {
                tail_need = IEEE80211_ENCRYPT_TAILROOM;
                tail_need -= skb_tailroom(skb);
                tail_need = max_t(int, tail_need, 0);