| From foo@baz Mon Sep 17 12:33:31 CEST 2018 |
| From: Sven Eckelmann <sven.eckelmann@openmesh.com> |
| Date: Thu, 26 Jul 2018 15:59:48 +0200 |
| Subject: ath10k: prevent active scans on potential unusable channels |
| |
| 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 |
| @@ -3074,6 +3074,13 @@ 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; |