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

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This reverts commit aac6af5534.

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>
This commit is contained in:
John W. Linville 2011-06-06 14:35:27 -04:00
parent d2ac49fe3c
commit ab6a44ce1d
3 changed files with 8 additions and 23 deletions
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3
net/mac80211/ieee80211_i.h
View File

@ -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

21
net/mac80211/key.c
View File

@ -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);
}

7
net/mac80211/tx.c
View File

@ -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);