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| author | Christian Lamparter <chunkeey@googlemail.com> | 2010-10-08 22:35:09 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-10-11 15:04:20 -0400 |
| commit | 15943a72c7d2031c9150917ca9161a9f891d455a (patch) | |
| tree | 5b9bd4a1e775e5a93c1898cd12ffa9c7789b169c /net/mac80211 | |
| parent | d12c74528e3065c90df70fbc06ec6ffd6e804738 (diff) | |
| download | kernel_samsung_smdk4412-15943a72c7d2031c9150917ca9161a9f891d455a.zip kernel_samsung_smdk4412-15943a72c7d2031c9150917ca9161a9f891d455a.tar.gz kernel_samsung_smdk4412-15943a72c7d2031c9150917ca9161a9f891d455a.tar.bz2 | |
mac80211: temporarily disable reorder release timer
Several serve threading problems in the current
release reorder timer implementation have been
discovered.
A lengthy discussion - which lists some of the
pitfalls and possible solutions - can be found at:
http://marc.info/?t=128635927000001
But due to the complicated nature of the subject and
the imminent advent of a new -rc cycle, it was
decided to disable the feature for the time being.
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211')
| -rw-r--r-- | net/mac80211/rx.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index b67221d..902b03e 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -622,6 +622,26 @@ static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, tid_agg_rx->buf_size; } + /* + * Disable the reorder release timer for now. + * + * The current implementation lacks a proper locking scheme + * which would protect vital statistic and debug counters + * from being updated by two different but concurrent BHs. + * + * More information about the topic is available from: + * - thread: http://marc.info/?t=128635927000001 + * + * What was wrong: + * => http://marc.info/?l=linux-wireless&m=128636170811964 + * "Basically the thing is that until your patch, the data + * in the struct didn't actually need locking because it + * was accessed by the RX path only which is not concurrent." + * + * List of what needs to be fixed: + * => http://marc.info/?l=linux-wireless&m=128656352920957 + * + if (tid_agg_rx->stored_mpdu_num) { j = index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; @@ -640,6 +660,10 @@ static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, } else { del_timer(&tid_agg_rx->reorder_timer); } + */ + +set_release_timer: + return; } /* |