[PATCH] ath10k: Fix interrupt storm

[Vasanthakumar Thiagarajan]

Promiscuous mode is enabled when wlan interface is added to
bridge. ath10k creates a monitor mode when promiscuous mode
is enabled. When monitor vdev is runing along with other
vdev(s) there is a huge number of interrupts generated
especially in noisy condition. Fix this by not enabling
promiscuous(monitor) mode when already a vdev is running.
This does not change the support of virtual interface of
type monitor along with other vdevs.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar at qti.qualcomm.com>
---
 drivers/net/wireless/ath/ath10k/mac.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index d6d2f0f..310e608 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -932,6 +932,14 @@ static int ath10k_vdev_start_restart(struct ath10k_vif *arvif, bool restart)
 		return ret;
 	}
 
+	if (ar->filter_flags & FIF_PROMISC_IN_BSS) {
+		ar->filter_flags &= ~FIF_PROMISC_IN_BSS;
+		ath10k_dbg(ar, ATH10K_DBG_MAC, "Disabling promiscuous mode when we start a vdev\n");
+		ret = ath10k_monitor_recalc(ar);
+		if (ret)
+			return ret;
+	}
+
 	ar->num_started_vdevs++;
 	ath10k_recalc_radar_detection(ar);
 
@@ -3369,6 +3377,14 @@ static void ath10k_configure_filter(struct ieee80211_hw *hw,
 
 	changed_flags &= SUPPORTED_FILTERS;
 	*total_flags &= SUPPORTED_FILTERS;
+	if (*total_flags & FIF_PROMISC_IN_BSS) {
+		if (ar->num_started_vdevs) {
+			ath10k_dbg(ar, ATH10K_DBG_MAC,
+				   "Not enabling promiscuous mode when already a vdev is running\n");
+			mutex_unlock(&ar->conf_mutex);
+			return;
+		}
+	}
 	ar->filter_flags = *total_flags;
 
 	ret = ath10k_monitor_recalc(ar);
-- 
1.7.9.5