Kernel warning in ath9k related to wpa_supplicant scanning

[B. J.]

This is with wpa_supplicant-0.7.3 and compat-wireless-2011-10-10:

...
nl80211: Event message available
nl80211: New scan results available
Received scan results (0 BSSes)
BSS: Start scan result update 6
New scan results available
Selecting BSS from priority group 0
Try to find WPA-enabled AP
Try to find non-WPA AP
No suitable network found
Setting scan request: 5 sec 0 usec
RTM_NEWLINK: operstate=0 ifi_flags=0x3 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'ath0' added
Starting AP scan for wildcard SSID
nl80211: Scan SSID - hexdump_ascii(len=0): [NULL]
Scan requested (ret=0) - scan timeout 30 seconds
nl80211: Event message available
nl80211: Scan trigger
------------[ cut here ]------------
WARNING: at /home/bp/P4/UTM-mainline/components/kernel/build/richland/ath9k/net/mac80211/rx.c:3002 ieee80211_rx+0xf4/0x9dc [mac80211]()
Rate marked as an HT rate but passed status->rate_idx is not an MCS index [0-76]: 93 (0x5d)