netdev - Re: WARNING at net/mac80211/rate.c:513 ieee80211_get_tx

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Date:	Fri, 29 Jan 2016 11:54:04 -0600
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Johannes Berg <johannes@...solutions.net>,
	Chaoming Li <chaoming_li@...lsil.com.cn>,
	Kalle Valo <kvalo@...eaurora.org>,
	David Miller <davem@...emloft.net>,
	Linux Wireless List <linux-wireless@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: WARNING at net/mac80211/rate.c:513 ieee80211_get_tx_rates
 [mac80211]

Linus,

Attached is a trial patch that fixes the problem on my system. As I told 
Johannes earlier, my AP was not configured to use VHT, thus I did not see the 
problem.

The test patch that Johannes sent earlier was close. The section needed to add 
VHT rates is:

--- a/drivers/net/wireless/realtek/rtlwifi/rc.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rc.c
@@ -138,6 +138,9 @@ static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
                     ((wireless_mode == WIRELESS_MODE_N_5G) ||
                      (wireless_mode == WIRELESS_MODE_N_24G)))
                         rate->flags |= IEEE80211_TX_RC_MCS;
+               if (sta && sta->vht_cap.vht_supported &&
+                   (wireless_mode == WIRELESS_MODE_AC_5G))
+                       rate->flags |= IEEE80211_TX_RC_VHT_MCS;
         }
  }

Larry


View attachment "0001-rtlwifi-Fix-warning-from-ieee80211_get_tx_rates-when.patch" of type "text/x-patch" (3231 bytes)