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    Subject[PATCH 4.9 36/70] ath10k: prevent active scans on potential unusable channels
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Sven Eckelmann <sven.eckelmann@openmesh.com>

    [ Upstream commit 3f259111583801013cb605bb4414aa529adccf1c ]

    The QCA4019 hw1.0 firmware 10.4-3.2.1-00050 and 10.4-3.5.3-00053 (and most
    likely all other) seem to ignore the WMI_CHAN_FLAG_DFS flag during the
    scan. This results in transmission (probe requests) on channels which are
    not "available" for transmissions.

    Since the firmware is closed source and nothing can be done from our side
    to fix the problem in it, the driver has to work around this problem. The
    WMI_CHAN_FLAG_PASSIVE seems to be interpreted by the firmware to not
    scan actively on a channel unless an AP was detected on it. Simple probe
    requests will then be transmitted by the STA on the channel.

    ath10k must therefore also use this flag when it queues a radar channel for
    scanning. This should reduce the chance of an active scan when the channel
    might be "unusable" for transmissions.

    Fixes: e8a50f8ba44b ("ath10k: introduce DFS implementation")
    Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
    Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/net/wireless/ath/ath10k/mac.c | 7 +++++++
    1 file changed, 7 insertions(+)

    --- a/drivers/net/wireless/ath/ath10k/mac.c
    +++ b/drivers/net/wireless/ath/ath10k/mac.c
    @@ -3003,6 +3003,13 @@ static int ath10k_update_channel_list(st
    passive = channel->flags & IEEE80211_CHAN_NO_IR;
    ch->passive = passive;

    + /* the firmware is ignoring the "radar" flag of the
    + * channel and is scanning actively using Probe Requests
    + * on "Radar detection"/DFS channels which are not
    + * marked as "available"
    + */
    + ch->passive |= ch->chan_radar;
    +
    ch->freq = channel->center_freq;
    ch->band_center_freq1 = channel->center_freq;
    ch->min_power = 0;

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