Commit 39e68712 authored Aug 05, 2011 by Helmut Schaa Committed by John W. Linville Aug 08, 2011

mac80211: Don't use a buf_size=0 in ADDBA requests



According to 802.11-2007, 7.3.1.14 it is compliant to use a buf_size of
0 in ADDBA requests. But some devices (AVM Fritz Stick N) arn't able to
handle that correctly and will reply with an ADDBA reponse with a
buf_size of 0 which in turn will disallow BA sessions for these
devices.

To work around this problem, initialize hw.max_tx_aggregation_subframes
to the maximum AMPDU buffer size 0x40.

Using 0 as default for the bufsize was introduced in commit
5dd36bc9 (mac80211: allow advertising
correct maximum aggregate size).

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

parent 3ca97880

net/mac80211/main.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -608,6 +608,7 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
		local->hw.max_rates = 1;
		local->hw.max_report_rates = 0;
		local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
		local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
		local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
		local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
		local->user_power_level = -1;

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