From: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Date: Thu, 27 Jul 2017 23:06:51 +0000 (+0300)
Subject: qtnfmac: implement scan timeout
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c7ead2abd26ab536a2e479af605a6d9529e3a694;p=linux.git

qtnfmac: implement scan timeout

Userspace tools may hang on scan in the case when scan completion event
is not returned by firmware. This patch implements the scan timeout
to avoid such situation.

Signed-off-by: Igor Mitsyanko <igor.mitsyanko.os@quantenna.com>
Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Avinash Patil <avinashp@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
---

diff --git a/drivers/net/wireless/quantenna/qtnfmac/cfg80211.c b/drivers/net/wireless/quantenna/qtnfmac/cfg80211.c
index ac8fdc1db4822..856fa6e8327ed 100644
--- a/drivers/net/wireless/quantenna/qtnfmac/cfg80211.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/cfg80211.c
@@ -579,19 +579,33 @@ qtnf_del_station(struct wiphy *wiphy, struct net_device *dev,
 	return ret;
 }
 
+static void qtnf_scan_timeout(unsigned long data)
+{
+	struct qtnf_wmac *mac = (struct qtnf_wmac *)data;
+
+	pr_warn("mac%d scan timed out\n", mac->macid);
+	qtnf_scan_done(mac, true);
+}
+
 static int
 qtnf_scan(struct wiphy *wiphy, struct cfg80211_scan_request *request)
 {
 	struct qtnf_wmac *mac = wiphy_priv(wiphy);
-	int ret;
 
 	mac->scan_req = request;
 
-	ret = qtnf_cmd_send_scan(mac);
-	if (ret)
+	if (qtnf_cmd_send_scan(mac)) {
 		pr_err("MAC%u: failed to start scan\n", mac->macid);
+		mac->scan_req = NULL;
+		return -EFAULT;
+	}
 
-	return ret;
+	mac->scan_timeout.data = (unsigned long)mac;
+	mac->scan_timeout.function = qtnf_scan_timeout;
+	mod_timer(&mac->scan_timeout,
+		  jiffies + QTNF_SCAN_TIMEOUT_SEC * HZ);
+
+	return 0;
 }
 
 static int
diff --git a/drivers/net/wireless/quantenna/qtnfmac/cfg80211.h b/drivers/net/wireless/quantenna/qtnfmac/cfg80211.h
index 5bd33124a7c84..6a4af52522b8d 100644
--- a/drivers/net/wireless/quantenna/qtnfmac/cfg80211.h
+++ b/drivers/net/wireless/quantenna/qtnfmac/cfg80211.h
@@ -34,10 +34,14 @@ static inline void qtnf_scan_done(struct qtnf_wmac *mac, bool aborted)
 		.aborted = aborted,
 	};
 
+	mutex_lock(&mac->mac_lock);
+
 	if (mac->scan_req) {
 		cfg80211_scan_done(mac->scan_req, &info);
 		mac->scan_req = NULL;
 	}
+
+	mutex_unlock(&mac->mac_lock);
 }
 
 #endif /* _QTN_FMAC_CFG80211_H_ */
diff --git a/drivers/net/wireless/quantenna/qtnfmac/core.c b/drivers/net/wireless/quantenna/qtnfmac/core.c
index 17d17e332a8b6..5e60180482d11 100644
--- a/drivers/net/wireless/quantenna/qtnfmac/core.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/core.c
@@ -288,6 +288,8 @@ static struct qtnf_wmac *qtnf_core_mac_alloc(struct qtnf_bus *bus,
 		mac->iflist[i].mac = mac;
 		mac->iflist[i].vifid = i;
 		qtnf_sta_list_init(&mac->iflist[i].sta_list);
+		mutex_init(&mac->mac_lock);
+		init_timer(&mac->scan_timeout);
 	}
 
 	qtnf_mac_init_primary_intf(mac);
diff --git a/drivers/net/wireless/quantenna/qtnfmac/core.h b/drivers/net/wireless/quantenna/qtnfmac/core.h
index 099aad76afeb2..066fcd1095a0b 100644
--- a/drivers/net/wireless/quantenna/qtnfmac/core.h
+++ b/drivers/net/wireless/quantenna/qtnfmac/core.h
@@ -46,6 +46,7 @@
 #define QTNF_MAX_EVENT_QUEUE_LEN	255
 #define QTNF_DEFAULT_BG_SCAN_PERIOD	300
 #define QTNF_MAX_BG_SCAN_PERIOD		0xffff
+#define QTNF_SCAN_TIMEOUT_SEC		15
 
 #define QTNF_DEF_BSS_PRIORITY		0
 #define QTNF_DEF_WDOG_TIMEOUT		5
@@ -147,6 +148,8 @@ struct qtnf_wmac {
 	struct cfg80211_scan_request *scan_req;
 	struct cfg80211_chan_def chandef;
 	struct cfg80211_chan_def csa_chandef;
+	struct mutex mac_lock;	/* lock during wmac speicific ops */
+	struct timer_list scan_timeout;
 };
 
 struct qtnf_hw_info {
diff --git a/drivers/net/wireless/quantenna/qtnfmac/event.c b/drivers/net/wireless/quantenna/qtnfmac/event.c
index 43d2e7fd6e021..0fc2814eafad2 100644
--- a/drivers/net/wireless/quantenna/qtnfmac/event.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/event.c
@@ -345,6 +345,8 @@ qtnf_event_handle_scan_complete(struct qtnf_wmac *mac,
 		return -EINVAL;
 	}
 
+	if (timer_pending(&mac->scan_timeout))
+		del_timer_sync(&mac->scan_timeout);
 	qtnf_scan_done(mac, le32_to_cpu(status->flags) & QLINK_SCAN_ABORTED);
 
 	return 0;