Hi Luis,
On Wed, 2009-06-10 at 13:35 -0700, Luis R. Rodriguez wrote:
> If we're associated to an AP and we manually decide to switch
> bands we have no guarantee we can communicate with that AP
> on the new band and our current bss parameters may change
> completely so disassociate.
>
> This fixes this warning (which is not specific to iwlwifi!):
>
> [25612.559460] ------------[ cut here ]------------
> [25612.559500] WARNING: at include/net/mac80211.h:2127 rate_control_send_low+0xcf/0xe0 [mac80211]()
> [25612.559508] Hardware name: VGN-N170G
> [25612.559513] Modules linked in: ath9k ath mac80211 cfg80211 <bleh line cut>
> [25612.559807] Pid: 14492, comm: iwconfig Not tainted 2.6.30-rc8-wl #11
> [25612.559814] Call Trace:
> [25612.559829] [<c03b2cd9>] ? printk+0x18/0x1f
> [25612.559865] [<f831072f>] ? rate_control_send_low+0xcf/0xe0 [mac80211]
> [25612.559878] [<c0134f4c>] warn_slowpath_common+0x6c/0xc0
> [25612.559912] [<f831072f>] ? rate_control_send_low+0xcf/0xe0 [mac80211]
> [25612.559923] [<c0134fb5>] warn_slowpath_null+0x15/0x20
> [25612.559957] [<f831072f>] rate_control_send_low+0xcf/0xe0 [mac80211]
> [25612.559985] [<f84129c3>] ath_get_rate+0x33/0x520 [ath9k]
> [25612.559998] [<c015cb73>] ? mark_held_locks+0x63/0x80
> [25612.560064] [<f831057d>] rate_control_get_rate+0xbd/0xd0 [mac80211]
> [25612.560102] [<f8318b6f>] invoke_tx_handlers+0x5df/0xfa0 [mac80211]
> [25612.560115] [<c015cb73>] ? mark_held_locks+0x63/0x80
> [25612.560152] [<f8317854>] ? __ieee80211_tx_prepare+0x194/0x3b0 [mac80211]
> [25612.560190] [<f8319796>] ieee80211_tx+0xd6/0x280 [mac80211]
> [25612.560227] [<f831972f>] ? ieee80211_tx+0x6f/0x280 [mac80211]
> [25612.560265] [<f8319e39>] ieee80211_master_start_xmit+0x1f9/0x400 [mac80211]
> [25612.560280] [<c032347b>] dev_hard_start_xmit+0x2ab/0x340
> [25612.560292] [<c0323230>] ? dev_hard_start_xmit+0x60/0x340
> [25612.560304] [<c0335675>] __qdisc_run+0x1e5/0x240
> [25612.560316] [<c03245d7>] dev_queue_xmit+0x377/0x4e0
> [25612.560328] [<c0324298>] ? dev_queue_xmit+0x38/0x4e0
> [25612.560365] [<f831c1d2>] ieee80211_tx_skb+0x52/0x60 [mac80211]
> [25612.560400] [<f83079d0>] ieee80211_send_delba+0xf0/0x150 [mac80211]
> [25612.560413] [<c013f931>] ? del_timer_sync+0x81/0xb0
> [25612.560447] [<f830903a>] __ieee80211_stop_rx_ba_session+0xea/0x1d0 [mac80211]
> [25612.560476] [<f8409310>] ? ath9k_ampdu_action+0x0/0x130 [ath9k]
> [25612.560511] [<f8307a63>] ieee80211_sta_tear_down_BA_sessions+0x33/0x40 [mac80211]
> [25612.560548] [<f830afd8>] ieee80211_set_disassoc+0xc8/0x370 [mac80211]
> [25612.560583] [<f830af10>] ? ieee80211_set_disassoc+0x0/0x370 [mac80211]
> [25612.560597] [<c01ace6b>] ? might_fault+0x4b/0xa0
> [25612.560632] [<f830b580>] ieee80211_sta_req_auth+0xa0/0xc0 [mac80211]
> [25612.560665] [<f8303fde>] ieee80211_ioctl_siwessid+0xbe/0xd0 [mac80211]
> [25612.560679] [<c02749c5>] ? copy_from_user+0x35/0x130
> [25612.560694] [<c039d819>] ioctl_standard_call+0x199/0x3a0
> [25612.560707] [<c032358d>] ? __dev_get_by_name+0x7d/0xa0
> [25612.560720] [<c039d31f>] wext_handle_ioctl+0x14f/0x230
> [25612.560753] [<f8303f20>] ? ieee80211_ioctl_siwessid+0x0/0xd0 [mac80211]
> [25612.560766] [<c0324114>] dev_ioctl+0x474/0x540
> [25612.560780] [<c019f685>] ? __pagevec_free+0x25/0x30
> [25612.560794] [<c0312350>] ? sock_ioctl+0x0/0x270
> [25612.560806] [<c0312445>] sock_ioctl+0xf5/0x270
> [25612.560817] [<c0312350>] ? sock_ioctl+0x0/0x270
> [25612.560831] [<c01d9018>] vfs_ioctl+0x28/0x90
> [25612.560843] [<c01d90f2>] do_vfs_ioctl+0x72/0x590
> [25612.560856] [<c015ce8b>] ? trace_hardirqs_on+0xb/0x10
> [25612.560868] [<c01b2a16>] ? remove_vma+0x56/0x70
> [25612.560879] [<c01b2a16>] ? remove_vma+0x56/0x70
> [25612.560890] [<c01b38f7>] ? do_munmap+0x237/0x290
> [25612.560902] [<c0103021>] ? sysenter_exit+0xf/0x1a
> [25612.560914] [<c01d9673>] sys_ioctl+0x63/0x70
> [25612.560925] [<c0102fec>] sysenter_do_call+0x12/0x38
> [25612.560934] ---[ end trace 05e1ecc810d6b568 ]---
> [25612.561114] ------------[ cut here ]------------
>
> Cc: Reinette Chatre <reinette.chatre@xxxxxxxxx>
> Cc: Zhu Yi <yi.zhu@xxxxxxxxx>
> Cc: Mohamed Abbas <mohamed.abbas@xxxxxxxxx>
> Cc: ipw3945-devel@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Luis R. Rodriguez <lrodriguez@xxxxxxxxxxx>
> ---
> net/mac80211/util.c | 17 ++++++++++++++++-
> 1 files changed, 16 insertions(+), 1 deletions(-)
>
> diff --git a/net/mac80211/util.c b/net/mac80211/util.c
> index 66ce96a..8e66556 100644
> --- a/net/mac80211/util.c
> +++ b/net/mac80211/util.c
> @@ -791,9 +791,24 @@ int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
>
> if (local->sw_scanning || local->hw_scanning)
> ret = 0;
> - else
> + else {
> + struct ieee80211_channel *cur_chan;
> +
> + cur_chan = local->hw.conf.channel;
> +
> + /*
> + * If we're switching bands and not scanning we
> + * could potentially be moving to a band our AP
> + * does not understand so give up on it
> + */
> + if (sdata->vif.type == NL80211_IFTYPE_STATION &&
> + (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED) &&
> + cur_chan->band != chan->band)
> + ieee80211_sta_deauthenticate(sdata,
> + WLAN_REASON_DEAUTH_LEAVING);
> ret = ieee80211_hw_config(
> local, IEEE80211_CONF_CHANGE_CHANNEL);
> + }
> }
>
> return ret;
This touches code targeted for removal in recent "mac80211: disconnect
when user changes channel" patch.
Reinette
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