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wifi: mac80211_hwsim: fix debugfs attribute ps with rc table support

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[ 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@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jonas Jelonek 2022-10-14 16:54:39 +02:00 committed by Greg Kroah-Hartman
parent 2fcc593b50
commit 92ae6facd1
1 changed files with 5 additions and 0 deletions
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5
drivers/net/wireless/mac80211_hwsim.c
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@ -775,6 +775,7 @@ 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;
@ -796,6 +797,10 @@ 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);