[PATCH] mac80211: fix rx-rate report when rate is invalid.

[PATCH] mac80211: fix rx-rate report when rate is invalid.

[greearb]

From: Ben Greear <greearb@candelatech.com>

This fixes obtaining the rate info via sta_set_sinfo
when the rx rate is invalid (for instance, on IBSS
interface that has received no frames from one of its
peers).

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 net/mac80211/sta_info.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 01868f9..868dc88 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -2076,10 +2076,12 @@ static void sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
 {
 	u16 rate = ACCESS_ONCE(sta_get_last_rx_stats(sta)->last_rate);
 
-	if (rate == STA_STATS_RATE_INVALID)
-		rinfo->flags = 0;
-	else
+	if (rate == STA_STATS_RATE_INVALID) {
+		rinfo->flags = 0; /* means use legacy rates */
+		rinfo->legacy = 0; /* Initialize legacy rates to known value */
+	} else {
 		sta_stats_decode_rate(sta->local, rate, rinfo);
+	}
 }
 
 static void sta_set_tidstats(struct sta_info *sta,
-- 
2.4.11

Re: [PATCH] mac80211: fix rx-rate report when rate is invalid.

[Johannes Berg]

On Mon, 2016-12-05 at 14:12 -0800, greearb@candelatech.com wrote:
> From: Ben Greear <greearb@candelatech.com>
> 
> This fixes obtaining the rate info via sta_set_sinfo
> when the rx rate is invalid (for instance, on IBSS
> interface that has received no frames from one of its
> peers).

Please fix this completely while at it, i.e.
make sta_set_rate_info_rx() have a return value and don't set
the BIT(NL80211_STA_INFO_RX_BITRATE) when there's no known rate.

johannes