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mac80211: Fix setting txpower to zero

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With multiple VIFS ath10k, and probably others, tries to find the
minimum txpower for all vifs and uses that when setting txpower in
the firmware.

If a second vif is added and starts to scan, it's txpower is not
initialized yet and it set to zero.

ath10k had a patch to ignore zero values, but then it is impossible
to actually set txpower to zero.

So, instead initialize the txpower to INT_MIN in mac80211, and let
drivers know that means the power has not been set and so should
be ignored.

This should fix regression in:

commit 88407beb1b
Author: Ryan Hsu <ryanhsu@qca.qualcomm.com>
Date:   Tue Dec 13 14:55:19 2016 -0800

    ath10k: fix incorrect txpower set by P2P_DEVICE interface

Tested on ath10k 9984 with ath10k-ct firmware.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Link: https://lore.kernel.org/r/20191217183057.24586-1-greearb@candelatech.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Ben Greear 2019-12-17 10:30:57 -08:00 committed by Johannes Berg
parent 9b125c2799
commit db6d9e9e8b
6 changed files with 14 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/wireless/ath/ath10k/mac.c
View File

@ -5103,7 +5103,8 @@ static int ath10k_mac_txpower_recalc(struct ath10k *ar)
lockdep_assert_held(&ar->conf_mutex);
list_for_each_entry(arvif, &ar->arvifs, list) {
if (arvif->txpower <= 0)
/* txpower not initialized yet? */
if (arvif->txpower == INT_MIN)
continue;
if (txpower == -1)

3
drivers/net/wireless/ath/ath9k/main.c
View File

@ -1196,6 +1196,9 @@ static void ath9k_tpc_vif_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
{
int *power = data;
if (vif->bss_conf.txpower == INT_MIN)
return;
if (*power < vif->bss_conf.txpower)
*power = vif->bss_conf.txpower;
}

7
drivers/net/wireless/ath/ath9k/xmit.c
View File

@ -2095,10 +2095,13 @@ static void setup_frame_info(struct ieee80211_hw *hw,
if (tx_info->control.vif) {
struct ieee80211_vif *vif = tx_info->control.vif;
if (vif->bss_conf.txpower == INT_MIN)
goto nonvifpower;
txpower = 2 * vif->bss_conf.txpower;
} else {
struct ath_softc *sc = hw->priv;
struct ath_softc *sc;
nonvifpower:
sc = hw->priv;
txpower = sc->cur_chan->cur_txpower;
}

2
include/net/mac80211.h
View File

@ -574,7 +574,7 @@ struct ieee80211_ftm_responder_params {
* @ssid: The SSID of the current vif. Valid in AP and IBSS mode.
* @ssid_len: Length of SSID given in @ssid.
* @hidden_ssid: The SSID of the current vif is hidden. Only valid in AP-mode.
* @txpower: TX power in dBm
* @txpower: TX power in dBm. INT_MIN means not configured.
* @txpower_type: TX power adjustment used to control per packet Transmit
* Power Control (TPC) in lower driver for the current vif. In particular
* TPC is enabled if value passed in %txpower_type is

1
net/mac80211/iface.c
View File

@ -1465,6 +1465,7 @@ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
sdata->control_port_no_encrypt = false;
sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
sdata->vif.bss_conf.idle = true;
sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
sdata->noack_map = 0;
sdata->hw_80211_encap = false;

2
net/mac80211/main.c
View File

@ -146,6 +146,8 @@ static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
continue;
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
continue;
if (sdata->vif.bss_conf.txpower == INT_MIN)
continue;
power = min(power, sdata->vif.bss_conf.txpower);
}
rcu_read_unlock();