ath10k: fix band reporting for mgmt CCK frames on 5GHz

Although CCK modulation isn't expected for 11a if
it happened it made ath10k report wrong band
(2GHz) for a mgmt frame that were actually
received on 5Ghz band. Frequency would also
decoded incorrectly too.

In case of 5GHz-only devices this triggered
mac80211 WARN_ON because there was no according
sband pointer to be found.

The patch should fix delivery of such frames by
using different means to acquire band parameter.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

1 files changed, 20 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c
index 9ea333a7789c..3ec6c9a84e84 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -875,6 +875,7 @@ static int ath10k_wmi_event_mgmt_rx(struct ath10k *ar, struct sk_buff *skb)
         struct wmi_mgmt_rx_event_v2 *ev_v2;
         struct wmi_mgmt_rx_hdr_v1 *ev_hdr;
         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+        struct ieee80211_channel *ch;
         struct ieee80211_hdr *hdr;
         u32 rx_status;
         u32 channel;
@@ -927,7 +928,25 @@ static int ath10k_wmi_event_mgmt_rx(struct ath10k *ar, struct sk_buff *skb)
         if (rx_status & WMI_RX_STATUS_ERR_MIC)
                 status->flag |= RX_FLAG_MMIC_ERROR;
 
-        status->band = phy_mode_to_band(phy_mode);
+        /* HW can Rx CCK rates on 5GHz. In that case phy_mode is set to
+         * MODE_11B. This means phy_mode is not a reliable source for the band
+         * of mgmt rx. */
+
+        ch = ar->scan_channel;
+        if (!ch)
+                ch = ar->rx_channel;
+
+        if (ch) {
+                status->band = ch->band;
+
+                if (phy_mode == MODE_11B &&
+                    status->band == IEEE80211_BAND_5GHZ)
+                        ath10k_dbg(ATH10K_DBG_MGMT, "wmi mgmt rx 11b (CCK) on 5GHz\n");
+        } else {
+                ath10k_warn("using (unreliable) phy_mode to extract band for mgmt rx\n");
+                status->band = phy_mode_to_band(phy_mode);
+        }
+
         status->freq = ieee80211_channel_to_frequency(channel, status->band);
         status->signal = snr + ATH10K_DEFAULT_NOISE_FLOOR;
         status->rate_idx = get_rate_idx(rate, status->band);