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Message-Id: <20221119021543.1775315-2-sashal@kernel.org>
Date: Fri, 18 Nov 2022 21:15:34 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Jonas Jelonek <jelonek.jonas@...il.com>,
Johannes Berg <johannes.berg@...el.com>,
Sasha Levin <sashal@...nel.org>, johannes@...solutions.net,
kvalo@...nel.org, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, linux-wireless@...r.kernel.org,
netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 02/11] wifi: mac80211_hwsim: fix debugfs attribute ps with rc table support
From: Jonas Jelonek <jelonek.jonas@...il.com>
[ Upstream commit 69188df5f6e4cecc6b76b958979ba363cd5240e8 ]
Fixes a warning that occurs when rc table support is enabled
(IEEE80211_HW_SUPPORTS_RC_TABLE) in mac80211_hwsim and the PS mode
is changed via the exported debugfs attribute.
When the PS mode is changed, a packet is broadcasted via
hwsim_send_nullfunc by creating and transmitting a plain skb with only
header initialized. The ieee80211 rate array in the control buffer is
zero-initialized. When ratetbl support is enabled, ieee80211_get_tx_rates
is called for the skb with sta parameter set to NULL and thus no
ratetbl can be used. The final rate array then looks like
[-1,0; 0,0; 0,0; 0,0] which causes the warning in ieee80211_get_tx_rate.
The issue is fixed by setting the count of the first rate with idx '0'
to 1 and hence ieee80211_get_tx_rates won't overwrite it with idx '-1'.
Signed-off-by: Jonas Jelonek <jelonek.jonas@...il.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/net/wireless/mac80211_hwsim.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 3a3a5a570694..f80b1d57d6c3 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -663,6 +663,7 @@ static void hwsim_send_nullfunc(struct mac80211_hwsim_data *data, u8 *mac,
struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
struct sk_buff *skb;
struct ieee80211_hdr *hdr;
+ struct ieee80211_tx_info *cb;
if (!vp->assoc)
return;
@@ -684,6 +685,10 @@ static void hwsim_send_nullfunc(struct mac80211_hwsim_data *data, u8 *mac,
memcpy(hdr->addr2, mac, ETH_ALEN);
memcpy(hdr->addr3, vp->bssid, ETH_ALEN);
+ cb = IEEE80211_SKB_CB(skb);
+ cb->control.rates[0].count = 1;
+ cb->control.rates[1].idx = -1;
+
rcu_read_lock();
mac80211_hwsim_tx_frame(data->hw, skb,
rcu_dereference(vif->chanctx_conf)->def.chan);
--
2.35.1
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