[PATCH v2 2/2] ath10k: fix rssi and rate reporting

[Janusz Dziedzic]

RSSI and RATES fields are valid only when START_VALID
bit is set. So, in current implementation we have to
remember/caclulate them when START_VALID and report the same
when only END_VALID is set.
Currently during heavy traffic we could have:
- 10 packets with START_VALID - correct RSSI and RATES
- 10 packets with END_VALID
- 10 packets with START_VALID - correct RSSI and RATES
- 10 packets with END_VALID
...
Next using monitor interface we will see:
- 10 packets with correct rssi/rates
- 10 packets with rssi=-95/rate=6Mbps

Signed-off-by: Janusz Dziedzic <janusz.dziedzic at tieto.com>
---
 drivers/net/wireless/ath/ath10k/htt_rx.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
index be25e16..f7ecc10 100644
--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -1154,8 +1154,6 @@ static void ath10k_htt_rx_handler(struct ath10k_htt *htt,
 
 	lockdep_assert_held(&htt->rx_ring.lock);
 
-	memset(rx_status, 0, sizeof(*rx_status));
-
 	fw_desc_len = __le16_to_cpu(rx->prefix.fw_rx_desc_bytes);
 	fw_desc = (u8 *)&rx->fw_desc;
 
@@ -1164,8 +1162,11 @@ static void ath10k_htt_rx_handler(struct ath10k_htt *htt,
 	mpdu_ranges = htt_rx_ind_get_mpdu_ranges(rx);
 
 	/* Fill this once, while this is per-ppdu */
-	rx_status->signal  = ATH10K_DEFAULT_NOISE_FLOOR;
-	rx_status->signal += rx->ppdu.combined_rssi;
+	if (rx->ppdu.info0 & HTT_RX_INDICATION_INFO0_START_VALID) {
+		memset(rx_status, 0, sizeof(*rx_status));
+		rx_status->signal  = ATH10K_DEFAULT_NOISE_FLOOR +
+				     rx->ppdu.combined_rssi;
+	}
 
 	if (rx->ppdu.info0 & HTT_RX_INDICATION_INFO0_END_VALID) {
 		/* TSF available only in 32-bit */
-- 
1.7.9.5