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mac80211: fix some key comments and code

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The key documentation is slightly out of date, fix
that. Also, the list entry in the key struct is no
longer used that way, so list_del_init() isn't
necessary any more there.

Finally, ieee80211_key_link() is no longer invoked
under RCU read lock, but rather with an appropriate
station lock held.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-01-03 19:51:09 +01:00 committed by John W. Linville
parent cc72128750
commit b5c34f662a
1 changed files with 17 additions and 21 deletions
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38
net/mac80211/key.c
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@ -30,19 +30,20 @@
* keys and per-station keys. Since each station belongs to an interface,
* each station key also belongs to that interface.
*
* Hardware acceleration is done on a best-effort basis, for each key
* that is eligible the hardware is asked to enable that key but if
* it cannot do that they key is simply kept for software encryption.
* There is currently no way of knowing this except by looking into
* debugfs.
* Hardware acceleration is done on a best-effort basis for algorithms
* that are implemented in software, for each key the hardware is asked
* to enable that key for offloading but if it cannot do that the key is
* simply kept for software encryption (unless it is for an algorithm
* that isn't implemented in software).
* There is currently no way of knowing whether a key is handled in SW
* or HW except by looking into debugfs.
*
* All key operations are protected internally.
*
* Within mac80211, key references are, just as STA structure references,
* protected by RCU. Note, however, that some things are unprotected,
* namely the key->sta dereferences within the hardware acceleration
* functions. This means that sta_info_destroy() must remove the key
* which waits for an RCU grace period.
* All key management is internally protected by a mutex. Within all
* other parts of mac80211, key references are, just as STA structure
* references, protected by RCU. Note, however, that some things are
* unprotected, namely the key->sta dereferences within the hardware
* acceleration functions. This means that sta_info_destroy() must
* remove the key which waits for an RCU grace period.
*/
static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
@ -279,13 +280,8 @@ static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
new->conf.keyidx);
}
if (old) {
/*
* We'll use an empty list to indicate that the key
* has already been removed.
*/
list_del_init(&old->list);
}
if (old)
list_del(&old->list);
}
struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
@ -420,8 +416,8 @@ int ieee80211_key_link(struct ieee80211_key *key,
struct sta_info *ap;
/*
* We're getting a sta pointer in,
* so must be under RCU read lock.
* We're getting a sta pointer in, so must be under
* appropriate locking for sta_info_get().
*/
/* same here, the AP could be using QoS */