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    mac80211: do not restart ps timer during scan or offchannel · 8c99f691
    Rajkumar Manoharan 提交于
    While leaving oper channel, STA informs sleep state to AP to
    stop sending data. Till sending ack for the nullfunc, AP
    continues to send the data to STA which restarts ps_timer that
    is causing unnecessary nullfunc exchange on timer expiry
    when the STA was already moved to offchannel. So don't restart ps_timer
    on data reception during scan. This issue was identified by
    the following warning.
    
    WARNING: at net/mac80211/tx.c:661 invoke_tx_handlers+0xf07/0x1330 [mac80211]
    wlan0: Dropped data frame as no usable bitrate found while scanning and
    associated. Target station: 00:03:7f:0b:a6:1b on 5 GHz band
    Call Trace:
      [<ffffffffa0413ba7>] invoke_tx_handlers+0xf07/0x1330 [mac80211]
      [<ffffffffa0414056>] ieee80211_tx+0x86/0x2c0 [mac80211]
      [<ffffffffa0414345>] ieee80211_xmit+0xb5/0x1d0 [mac80211]
      [<ffffffffa04037e0>] ieee80211_dynamic_ps_enable_work+0x0/0xb0 [mac80211]
      [<ffffffffa04158cf>] ieee80211_tx_skb+0x4f/0x60 [mac80211]
      [<ffffffffa04026e6>] ieee80211_send_nullfunc+0x46/0x60 [mac80211]
      [<ffffffffa0403885>] ieee80211_dynamic_ps_enable_work+0xa5/0xb0 [mac80211]
    Reviewed-by: NJohannes Berg <johannes@sipsolutions.net>
    Signed-off-by: NRajkumar Manoharan <rmanoharan@atheros.com>
    Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
    8c99f691
rx.c 81.6 KB