From b28dc141266f2894a7fc4329c790eb0d0343de83 Mon Sep 17 00:00:00 2001
From: Yun Park <yunp@codeaurora.org>
Date: Tue, 14 Nov 2017 10:45:16 -0800
Subject: [PATCH] qcacld-3.0: Set PF_WAKE_UP_IDLE flag in the IPA Rx exception
 callback

Prevent CPU bottleneck caused by scheduling the user process running
on the same CPU with IPA worker thread.
Set PF_WAKE_UP_IDLE flag in the IPA Rx exception callback, to wake
user task to idle CPU.

Change-Id: Ifd5b917c46fff39febd7e98f4761c9e80000ea35
CRs-Fixed: 2131917
---
 core/hdd/src/wlan_hdd_ipa.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/core/hdd/src/wlan_hdd_ipa.c b/core/hdd/src/wlan_hdd_ipa.c
index 6d547dda12d0..7e5fa03e849f 100644
--- a/core/hdd/src/wlan_hdd_ipa.c
+++ b/core/hdd/src/wlan_hdd_ipa.c
@@ -4125,6 +4125,7 @@ static void hdd_ipa_send_skb_to_network(qdf_nbuf_t skb,
 	int result;
 	struct hdd_ipa_priv *hdd_ipa = ghdd_ipa;
 	unsigned int cpu_index;
+	uint32_t enabled;
 
 	if (!adapter || adapter->magic != WLAN_HDD_ADAPTER_MAGIC) {
 		HDD_IPA_LOG(QDF_TRACE_LEVEL_DEBUG, "Invalid adapter: 0x%pK",
@@ -4140,6 +4141,14 @@ static void hdd_ipa_send_skb_to_network(qdf_nbuf_t skb,
 		return;
 	}
 
+	/*
+	 * Set PF_WAKE_UP_IDLE flag in the task structure
+	 * This task and any task woken by this will be waken to idle CPU
+	 */
+	enabled = sched_get_wake_up_idle(current);
+	if (!enabled)
+		sched_set_wake_up_idle(current, true);
+
 	skb->destructor = hdd_ipa_uc_rt_debug_destructor;
 	skb->dev = adapter->dev;
 	skb->protocol = eth_type_trans(skb, skb->dev);
@@ -4155,6 +4164,12 @@ static void hdd_ipa_send_skb_to_network(qdf_nbuf_t skb,
 		++adapter->hdd_stats.tx_rx_stats.rx_refused[cpu_index];
 
 	hdd_ipa->ipa_rx_net_send_count++;
+
+	/*
+	 * Restore PF_WAKE_UP_IDLE flag in the task structure
+	 */
+	if (!enabled)
+		sched_set_wake_up_idle(current, false);
 }
 
 /**