Re: [PATCH v2 2/3] rt2x00: check number of EPROTO errors

[Stanislaw Gruszka <sgruszka@redhat.com>]

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On Thu, Jan 10, 2019 at 03:29:44PM +0100, Jeroen Roovers wrote:
> Aaaaaaand the results are in.
> 
> On Thu, 10 Jan 2019 at 08:49, Jeroen Roovers <jer@airfi.aero> wrote:
> >
> >      Hi Stanislaw,
> >
> > On Wed, 9 Jan 2019 at 12:33, Stanislaw Gruszka <sgruszka@redhat.com> wrote:
> >
> > > So would be below patch (on top of this set) be a solution for at
> > > least to not kill the kernel. Or we looking for something better
> > > i.e. watchdog ?
> >
> > I'll give it a spin. Thanks!
> 
> hostapd: wlan0: STA xx:xx:xx:xx:xx:xx IEEE 802.11: disassociated due
> to inactivity
> kernel: [  500.782266] ieee80211 phy0: rt2x00usb_vendor_request: Error
> - Vendor Request 0x07 failed for offset 0x6888 with error -110
> kernel: [  500.912237] ieee80211 phy0: rt2x00usb_vendor_request: Error
> - Vendor Request 0x06 failed for offset 0x6888 with error -110
> kernel: [  501.042235] ieee80211 phy0: rt2x00usb_vendor_request: Error
> - Vendor Request 0x06 failed for offset 0x6110 with error -110
> hostapd: wlan0: STA xx:xx:xx:xx:xx:xx IEEE 802.11: deauthenticated due
> to inactivity (timer DEAUTH/REMOVE)
> kernel: [  501.772201] ieee80211 phy0: rt2x00usb_vendor_request: Error
> - Vendor Request 0x07 failed for offset 0x1018 with error -110
> kernel: [  501.902177] ieee80211 phy0: rt2x00usb_vendor_request: Error
> - Vendor Request 0x06 failed for offset 0x1018 with error -110
> kernel: [  501.972186] ieee80211 phy0: rt2x00usb_vendor_request: Error
> - Vendor Request 0x06 failed for offset 0x1910 with error -110
> hostapd: wlan0: STA xx:xx:xx:xx:xx:xx IEEE 802.11: disassociated due
> to inactivity
> hostapd: wlan0: STA xx:xx:xx:xx:xx:xx IEEE 802.11: deauthenticated due
> to inactivity (timer DEAUTH/REMOVE)
> hostapd: wlan0: STA xx:xx:xx:xx:xx:xx IEEE 802.11: disassociated due
> to inactivity
> hostapd: wlan0: STA xx:xx:xx:xx:xx:xx IEEE 802.11: deauthenticated due
> to inactivity (timer DEAUTH/REMOVE)
> hostapd: wlan0: STA xx:xx:xx:xx:xx:xx IEEE 802.11: disassociated due
> to inactivity
> hostapd: wlan0: STA xx:xx:xx:xx:xx:xx IEEE 802.11: deauthenticated due
> to inactivity (timer DEAUTH/REMOVE)
> hostapd: wlan0: STA xx:xx:xx:xx:xx:xx IEEE 802.11: disassociated due
> to inactivity
> hostapd: wlan0: STA xx:xx:xx:xx:xx:xx IEEE 802.11: deauthenticated due
> to inactivity (timer DEAUTH/REMOVE)
> 
> rt2x00usb_check_usb_error in your patch is set to
> clearDEVICE_STATE_PRESENT after ten errors, but in this case only 6
> errors were seen. Maybe I should set it to 1 as I have never seen an
> RT5592 recover from this.

I know cases where we have only single USB error and device work after
that. But if I remember correctly it was only for EPROTO not ETIMEDOUT.

> The system remained relatively stable until after I tried forcibly
> removing and then loading the rt2800usb module. A simple `ifconfig`
> then triggered a kernel panic. Sadly I couldn't capture it in time but
> I did spot that more phyN (up to phy4) devices had been added.

Apparently we should not crash and that should be fixed, but without
logs there is nothing we can do.

Let try to attack problem from other side. RT5592 mises TSSI
calibration, so perhaps device overheat for you because of that.
Please apply attached patch which fixes txpower setting in mac80211
then set some low txpower value i.e:

iw dev wlan0 set txpower fixed 1500

and check if device still stop working with USB errors.

Regards
Stanislaw


[-- Attachment #2: mac80211_fix_set_txpower_for_no_chanctx.patch --]
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diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 818aa0060349..ca513e94be9e 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -2415,6 +2415,8 @@ static int ieee80211_set_tx_power(struct wiphy *wiphy,
 	bool update_txp_type = false;
 	bool has_monitor = false;
 
+	printk("%s mbm %d\n", __func__, mbm);
+
 	if (wdev) {
 		sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 3a0171a65db3..022874bf49f3 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -49,19 +49,23 @@ static void ieee80211_iface_work(struct work_struct *work);
 
 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
 {
+	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_chanctx_conf *chanctx_conf;
 	int power;
 
-	rcu_read_lock();
-	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
-	if (!chanctx_conf) {
+	if (local->use_chanctx) {
+		rcu_read_lock();
+		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+		if (!chanctx_conf) {
+			rcu_read_unlock();
+			return false;
+		}
+		power = ieee80211_chandef_max_power(&chanctx_conf->def);
 		rcu_read_unlock();
-		return false;
+	} else {
+		power = ieee80211_chandef_max_power(&local->hw.conf.chandef);
 	}
 
-	power = ieee80211_chandef_max_power(&chanctx_conf->def);
-	rcu_read_unlock();
-
 	if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
 		power = min(power, sdata->user_power_level);
 
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 7b8320d4a8e4..6005c5e09be6 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -144,10 +144,14 @@ static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
-		if (!rcu_access_pointer(sdata->vif.chanctx_conf))
-			continue;
 		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 			continue;
+		if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
+			power = min(power, sdata->user_power_level);
+		if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
+			power = min(power, sdata->ap_power_level);
+		if (!rcu_access_pointer(sdata->vif.chanctx_conf))
+			continue;
 		power = min(power, sdata->vif.bss_conf.txpower);
 	}
 	rcu_read_unlock();