linux.git/net/mac80211, branch v2.6.29

mac80211: Fix panic on fragmentation with power saving

2009-03-16T22:01:59+00:00

It was possible to hit a kernel panic on NULL pointer dereference in
dev_queue_xmit() when sending power save buffered frames to a STA that
woke up from sleep. This happened when the buffered frame was requeued
for transmission in ap_sta_ps_end(). In order to avoid the panic, copy
the skb->dev and skb->iif values from the first fragment to all other
fragments.

Signed-off-by: Jouni Malinen 
Signed-off-by: John W. Linville

mac80211: restrict to AP in outgoing interface heuristic

2009-02-11T16:27:17+00:00

We try to find the correct outgoing interface for injected frames
based on the TA, but since this is a hack for hostapd 11w, restrict
the heuristic to AP mode interfaces. At some point we'll add the
ability to give an interface index in radiotap or so and just
remove this heuristic again.

Signed-off-by: Johannes Berg 
Cc: stable@kernel.org [2.6.28.x]
Signed-off-by: John W. Linville

mac80211: fix slot time debug message

2009-01-22T18:55:01+00:00

wlan0: switched to short barker preamble (BSSID=00:01:aa:bb:cc:dd)
wlan0: switched to short slot (BSSID=) 

should be:

wlan0: switched to short barker preamble (BSSID=00:01:aa:bb:cc:dd)
wlan0: switched to short slot (BSSID=00:01:aa:bb:cc:dd)

Signed-off-by: Christian Lamparter 
Signed-off-by: John W. Linville

mac80211: decrement ref count to netdev after launching mesh discovery

2009-01-22T18:55:00+00:00

After launching mesh discovery in tx path, reference count was not being
decremented.  This was preventing module unload.

Signed-off-by: Brian Cavagnolo 
Signed-off-by: Andrey Yurovsky 
Acked-by: Johannes Berg 
Signed-off-by: John W. Linville

mac80211: more kernel-doc fixes

2009-01-16T22:08:23+00:00

Fix (delete) more mac80211 kernel-doc:

Warning(linux-2.6.28-git13//include/net/mac80211.h:375): Excess struct/union/enum/typedef member 'retry_count' description in 'ieee80211_tx_info'
Warning(linux-2.6.28-git13//net/mac80211/sta_info.h:308): Excess struct/union/enum/typedef member 'last_txrate' description in 'sta_info'

Signed-off-by: Randy Dunlap 
Signed-off-by: John W. Linville

mac80211: fix "‘ret’ may be used uninitialized" warning

2009-01-13T15:25:45+00:00

net/mac80211/ht.c: In function ‘ieee80211_start_tx_ba_session’:
net/mac80211/ht.c:472: warning: ‘ret’ may be used uninitialized in this function

Signed-off-by: John W. Linville

mac80211: initialize RC data for all mesh links upon allocation

2009-01-12T19:24:57+00:00

This patch fixes a panic that might occur, if the device is part of a mesh
and tries to send with a higher rate index than "0".

kernel BUG at net/mac80211/rate.c:239!
invalid opcode: 0000 [#1] SMP
[...]
 Call Trace:
  <0> ? invoke_tx_handlers+0x474/0xb57 [mac80211]
 ? __ieee80211_tx_prepare+0x260/0x2a8 [mac80211]
 ? ieee80211_master_start_xmit+0x300/0x43a [mac80211]
 ? __qdisc_run+0xde/0x1da
 ? net_tx_action+0xb4/0x102
 Kernel panic - not syncing: Fatal exception in interrupt

Signed-off-by: Christian Lamparter 
Signed-off-by: John W. Linville

mac80211: allow mode change if IBSS is not allowed

2009-01-12T19:24:56+00:00

Changing mode on an interface is not allowed if IBSS is disabled for the
current channel.  That restriction should only apply when switching to
the ad-hoc mode, as it was prior to "cfg80211: handle SIOCGIWMODE/SIOCSIWMODE".

Signed-off-by: Pavel Roskin 
Signed-off-by: John W. Linville

minstrel: fix warning if lowest supported rate index is not 0

2009-01-12T19:24:55+00:00

This patch fixes the following WARNING (caused by rix_to_ndx): "
>WARNING: at net/mac80211/rc80211_minstrel.c:69 minstrel_rate_init+0xd2/0x33a [mac80211]()
>[...]
>Call Trace:
> warn_on_slowpath+0x51/0x75
> _format_mac_addr+0x4c/0x88
> minstrel_rate_init+0xd2/0x33a [mac80211]
> print_mac+0x16/0x1b
> schedule_hrtimeout_range+0xdc/0x107
> ieee80211_add_station+0x158/0x1bd [mac80211]
> nl80211_new_station+0x1b3/0x20b [cfg80211]

The reason is that I'm experimenting with "g" only mode on a 802.11 b/g card.

Therefore rate_lowest_index returns 4 (= 6Mbit, instead of usual 0 = 1Mbit).
Since mi->r array is initialized with zeros in minstrel_alloc_sta,
rix_to_ndx has a hard time to find the 6Mbit entry and will trigged the WARNING.

Signed-off-by: Christian Lamparter 
Acked-by: Felix Fietkau 
Signed-off-by: John W. Linville

mac80211: implement dynamic power save

2008-12-19T20:24:00+00:00

This patch implements dynamic power save for mac80211. Basically it
means enabling power save mode after an idle period. Implementing it
dynamically gives a good compromise of low power consumption and low
latency. Some hardware have support for this in firmware, but some
require the host to do it.

The dynamic power save is implemented by adding an timeout to
ieee80211_subif_start_xmit(). The timeout can be enabled from userspace
with Wireless Extensions. For example, the command below enables the
dynamic power save and sets the time timeout to 500 ms:

iwconfig wlan0 power timeout 500m

Power save now only works with devices which handle power save in firmware.
It's also disabled by default and the heuristics when and how to enable is
considered as a policy decision and will be left for the userspace to handle.
In case the firmware has support for this, drivers can disable this feature
with IEEE80211_HW_NO_STACK_DYNAMIC_PS.

Big thanks to Johannes Berg for the help with the design and code.

Signed-off-by: Kalle Valo 
Acked-by: Johannes Berg 
Signed-off-by: John W. Linville