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>

1 files changed, 2 insertions, 19 deletions

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 31afd712..f825e2f 100644
--- 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);
 }