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From: Fabio Rossi <rossi.f@inwind.it>
To: linux-wireless@vger.kernel.org
Subject: WARNING: at net/mac80211/tx.c:561
Date: Thu, 23 Jul 2009 00:51:56 +0200
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I'm using the last wireless-testing.git and I have experienced the following 
WARNING:

 WARNING: at net/mac80211/tx.c:561 ieee80211_tx_h_rate_ctrl+0x3d1/0x470 
[mac80211]()
 Hardware name: System Name
 wlan0: Dropped data frame as no usable bitrate found while scanning and 
associated. Target station: 00:0c:f6:xx:xx:xx on 5 GHz band
 Modules linked in: ath5k mac80211 ath cfg80211
 Pid: 1270, comm: phy0 Tainted: G        W  2.6.31-rc3-wl #140
 Call Trace:
  [<e1aaa0a1>] ? ieee80211_tx_h_rate_ctrl+0x3d1/0x470 [mac80211]
  [<e1aaa0a1>] ? ieee80211_tx_h_rate_ctrl+0x3d1/0x470 [mac80211]
  [<c101d37c>] warn_slowpath_common+0x7c/0xa0
  [<e1aaa0a1>] ? ieee80211_tx_h_rate_ctrl+0x3d1/0x470 [mac80211]
  [<c101d3e6>] warn_slowpath_fmt+0x26/0x30
  [<e1aaa0a1>] ieee80211_tx_h_rate_ctrl+0x3d1/0x470 [mac80211]
  [<e1af8afb>] ? ath5k_hw_reset_tx_queue+0x51b/0x830 [ath5k]
  [<e1aa8aa5>] ? ieee80211_tx_prepare+0x105/0x320 [mac80211]
  [<e1aaa489>] invoke_tx_handlers+0x69/0xf0 [mac80211]
  [<e1aaa64f>] ieee80211_tx+0x5f/0x1f0 [mac80211]
  [<c139f940>] ? skb_release_data+0x50/0x90
  [<c139fa83>] ? pskb_expand_head+0x103/0x190
  [<e1aaa8e5>] ieee80211_xmit+0x105/0x270 [mac80211]
  [<e1aaaa9e>] ieee80211_tx_skb+0x4e/0x60 [mac80211]
  [<e1aad7a2>] ieee80211_send_probe_req+0x112/0x180 [mac80211]
  [<c1017168>] ? dequeue_task+0x48/0x90
  [<c101e11b>] ? printk+0x1b/0x20
  [<e1a9ea9a>] ieee80211_mgd_probe_ap+0x11a/0x150 [mac80211]
  [<e1a9eb12>] ieee80211_beacon_loss_work+0x12/0x20 [mac80211]
  [<c102c75c>] worker_thread+0xec/0x1c0
  [<c1454b7d>] ? schedule+0x18d/0x370
  [<e1a9eb00>] ? ieee80211_beacon_loss_work+0x0/0x20 [mac80211]
  [<c102f740>] ? autoremove_wake_function+0x0/0x40
  [<c102c670>] ? worker_thread+0x0/0x1c0
  [<c102f494>] kthread+0x74/0x80
  [<c102f420>] ? kthread+0x0/0x80
  [<c10032d3>] kernel_thread_helper+0x7/0x14
 ---[ end trace a5a80f7488aa4974 ]---

I have a 802.11abg wireless NIC and I'm currently using a 802.11g access 
point.

Fabio