From f0e92d4918fd97a602f10acc2b431045afb4200b Mon Sep 17 00:00:00 2001
From: Matt Wagner <mwagner@nvidia.com>
Date: Thu, 23 Aug 2012 11:32:31 -0700
Subject: Revert "video: tegra: hdcp: Fix Locking Issue"

This reverts commit 51f746421b73f8f378bd7908b35fd6c79687e239.

Bug 1030468
Bug 1030415

Signed-off-by: Matt Wagner <mwagner@nvidia.com>
Change-Id: If9b5febd812e84848913431dcaf0bdefc518e5d1
Reviewed-on: http://git-master/r/126948
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Jon Mayo <jmayo@nvidia.com>
---
 drivers/video/tegra/dc/nvhdcp.c | 28 +++++++---------------------
 1 file changed, 7 insertions(+), 21 deletions(-)

(limited to 'drivers/video/tegra/dc')

diff --git a/drivers/video/tegra/dc/nvhdcp.c b/drivers/video/tegra/dc/nvhdcp.c
index b509a6c78499..3566e2bd33b5 100644
--- a/drivers/video/tegra/dc/nvhdcp.c
+++ b/drivers/video/tegra/dc/nvhdcp.c
@@ -78,7 +78,6 @@ struct tegra_nvhdcp {
 	struct tegra_dc_hdmi_data	*hdmi;
 	struct workqueue_struct		*downstream_wq;
 	struct mutex			lock;
-	struct mutex			state_lock;
 	struct miscdevice		miscdev;
 	char				name[12];
 	unsigned			id;
@@ -981,9 +980,7 @@ static void nvhdcp_downstream_worker(struct work_struct *work)
 
 	nvhdcp_vdbg("CRYPT enabled\n");
 
-	mutex_lock(&nvhdcp->state_lock);
 	nvhdcp->state = STATE_LINK_VERIFY;
-	mutex_unlock(&nvhdcp->state_lock);
 	nvhdcp_info("link verified!\n");
 
 	while (1) {
@@ -1010,39 +1007,30 @@ failure:
 	if(nvhdcp->fail_count > 5) {
 	        nvhdcp_err("nvhdcp failure - too many failures, giving up!\n");
 	} else {
-		if (!nvhdcp_is_plugged(nvhdcp)) {
-			nvhdcp_err("nvhdcp failure\n");
-			goto lost_hdmi;
-		}
 		nvhdcp_err("nvhdcp failure - renegotiating in 1 second\n");
+		if (!nvhdcp_is_plugged(nvhdcp))
+			goto lost_hdmi;
 		queue_delayed_work(nvhdcp->downstream_wq, &nvhdcp->work,
 						msecs_to_jiffies(1000));
 	}
 
 lost_hdmi:
-	mutex_lock(&nvhdcp->state_lock);
 	nvhdcp->state = STATE_UNAUTHENTICATED;
-	mutex_unlock(&nvhdcp->state_lock);
 	hdcp_ctrl_run(hdmi, 0);
 
 err:
 	mutex_unlock(&nvhdcp->lock);
 	return;
 disable:
-	mutex_lock(&nvhdcp->state_lock);
 	nvhdcp->state = STATE_OFF;
 	nvhdcp_set_plugged(nvhdcp, false);
-	mutex_unlock(&nvhdcp->state_lock);
 	mutex_unlock(&nvhdcp->lock);
 	return;
 }
 
 static int tegra_nvhdcp_on(struct tegra_nvhdcp *nvhdcp)
 {
-	mutex_lock(&nvhdcp->state_lock);
-	nvhdcp_set_plugged(nvhdcp, true);
 	nvhdcp->state = STATE_UNAUTHENTICATED;
-	mutex_unlock(&nvhdcp->state_lock);
 	if (nvhdcp_is_plugged(nvhdcp)) {
 		nvhdcp->fail_count = 0;
 		queue_delayed_work(nvhdcp->downstream_wq, &nvhdcp->work,
@@ -1053,10 +1041,10 @@ static int tegra_nvhdcp_on(struct tegra_nvhdcp *nvhdcp)
 
 static int tegra_nvhdcp_off(struct tegra_nvhdcp *nvhdcp)
 {
-	mutex_lock(&nvhdcp->state_lock);
+	mutex_lock(&nvhdcp->lock);
 	nvhdcp->state = STATE_OFF;
 	nvhdcp_set_plugged(nvhdcp, false);
-	mutex_unlock(&nvhdcp->state_lock);
+	mutex_unlock(&nvhdcp->lock);
 	wake_up_interruptible(&wq_worker);
 	flush_workqueue(nvhdcp->downstream_wq);
 	return 0;
@@ -1067,6 +1055,7 @@ void tegra_nvhdcp_set_plug(struct tegra_nvhdcp *nvhdcp, bool hpd)
 	nvhdcp_debug("hdmi hotplug detected (hpd = %d)\n", hpd);
 
 	if (hpd) {
+		nvhdcp_set_plugged(nvhdcp, true);
 		tegra_nvhdcp_on(nvhdcp);
 	} else {
 		tegra_nvhdcp_off(nvhdcp);
@@ -1091,9 +1080,9 @@ int tegra_nvhdcp_set_policy(struct tegra_nvhdcp *nvhdcp, int pol)
 
 static int tegra_nvhdcp_renegotiate(struct tegra_nvhdcp *nvhdcp)
 {
-	mutex_lock(&nvhdcp->state_lock);
+	mutex_lock(&nvhdcp->lock);
 	nvhdcp->state = STATE_RENEGOTIATE;
-	mutex_unlock(&nvhdcp->state_lock);
+	mutex_unlock(&nvhdcp->lock);
 	tegra_nvhdcp_on(nvhdcp);
 	return 0;
 }
@@ -1212,7 +1201,6 @@ struct tegra_nvhdcp *tegra_nvhdcp_create(struct tegra_dc_hdmi_data *hdmi,
 	snprintf(nvhdcp->name, sizeof(nvhdcp->name), "nvhdcp%u", id);
 	nvhdcp->hdmi = hdmi;
 	mutex_init(&nvhdcp->lock);
-	mutex_init(&nvhdcp->state_lock);
 
 	strlcpy(nvhdcp->info.type, nvhdcp->name, sizeof(nvhdcp->info.type));
 	nvhdcp->bus = bus;
@@ -1236,9 +1224,7 @@ struct tegra_nvhdcp *tegra_nvhdcp_create(struct tegra_dc_hdmi_data *hdmi,
 		goto free_nvhdcp;
 	}
 
-	mutex_lock(&nvhdcp->state_lock);
 	nvhdcp->state = STATE_UNAUTHENTICATED;
-	mutex_unlock(&nvhdcp->state_lock);
 
 	nvhdcp->downstream_wq = create_singlethread_workqueue(nvhdcp->name);
 	INIT_DELAYED_WORK(&nvhdcp->work, nvhdcp_downstream_worker);
-- 
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