[PATCH] mac80211: Fix bogus RCU warning from ieee80211_get_tx_rates (Was: Re: rcu)

[Calvin Owens <jcalvinowens@gmail.com>]

rate_control_fill_sta_table(), whose sole caller is ieee80211_get_tx_rates(),
is guaranteed by mac80211 not to be called concurrently with
rate_control_set_rates() [1], the sole function that touches the rate table
pointer/data in struct ieee80211_sta. The RCU dereference is therefore safe.

[1]: See commit f6b3d85f7f6d6

Signed-off-by: Calvin Owens <jcalvinowens@gmail.com>
---
 net/mac80211/rate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
index d3f414f..585297d 100644
--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -539,7 +539,7 @@ static void rate_control_fill_sta_table(struct ieee80211_sta *sta,
 	int i;
 
 	if (sta && !info->control.skip_table)
-		ratetbl = rcu_dereference(sta->rates);
+		ratetbl = rcu_dereference_protected(sta->rates, true);
 
 	/* Fill remaining rate slots with data from the sta rate table. */
 	max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE);
-- 
1.8.2.1