[PATCH] cfg80211: improve warnings in VHT rate calculation

[Johannes Berg]

From: Johannes Berg <johannes.b...@intel.com>

Linus reported hitting the bandwidth warning, but it is indeed
pretty useless - improve it by printing the rate configuration
and make it only warn once, for both warnings here.

Reported-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Johannes Berg <johannes.b...@intel.com>
---
 net/wireless/util.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 7198373e2920..a10d5c7bdf63 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -1217,8 +1217,8 @@ static u32 cfg80211_calculate_bitrate_vht(struct 
rate_info *rate)
        u32 bitrate;
        int idx;
 
-       if (WARN_ON_ONCE(rate->mcs > 9))
-               return 0;
+       if (rate->mcs > 9)
+               goto warn;
 
        switch (rate->bw) {
        case RATE_INFO_BW_160:
@@ -1233,8 +1233,7 @@ static u32 cfg80211_calculate_bitrate_vht(struct 
rate_info *rate)
        case RATE_INFO_BW_5:
        case RATE_INFO_BW_10:
        default:
-               WARN_ON(1);
-               /* fall through */
+               goto warn;
        case RATE_INFO_BW_20:
                idx = 0;
        }
@@ -1247,6 +1246,10 @@ static u32 cfg80211_calculate_bitrate_vht(struct 
rate_info *rate)
 
        /* do NOT round down here */
        return (bitrate + 50000) / 100000;
+ warn:
+       WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
+                 rate->bw, rate->mcs, rate->nss);
+       return 0;
 }
 
 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
-- 
2.11.0