From 90075ae2b50c4342dff880085f7342cb961456d5 Mon Sep 17 00:00:00 2001
From: Jeff Hatch <jhatch@multitech.com>
Date: Fri, 20 Nov 2020 13:51:12 -0600
Subject: Fix cleanup of supercap worker so that it doesn't cause kernel panic
 during unloading mts-io during normal operation, there was missing
 lock/unlock of mts-io mutex

---
 io-module/mts-io.c       | 6 ++++++
 io-module/mts_supercap.c | 7 ++++++-
 io-module/mts_supercap.h | 2 +-
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/io-module/mts-io.c b/io-module/mts-io.c
index 83c3ddf..6c14a74 100644
--- a/io-module/mts-io.c
+++ b/io-module/mts-io.c
@@ -1255,6 +1255,12 @@ static void __exit mts_io_exit(void)
                 gpio_free(pin->pin.gpio);
        
 	cleanup_buttons();
+
+	//cleanup supercap monitor worker if SUPERCAP CAPA is true
+	if(DEVICE_CAPA(id_eeprom.capa, CAPA_SUPERCAP)) {
+		 cleanup_supercap_worker();
+	}
+
 	cleanup();
 	if (DEVICE_CAPA(id_eeprom.capa, CAPA_LORA) && attr_group_lora) {
 		mts_teardown_lora_port();
diff --git a/io-module/mts_supercap.c b/io-module/mts_supercap.c
index e028408..6cd9841 100644
--- a/io-module/mts_supercap.c
+++ b/io-module/mts_supercap.c
@@ -74,6 +74,8 @@ static void supercap_worker(struct work_struct *ignored)
 	struct pid *vpid;
 	int running_on_cap = 0;
 
+	mutex_lock(&mts_io_mutex);
+
 	pin = gpio_pin_by_attr_name("power-fail");
 
 	if (pin) {
@@ -83,6 +85,7 @@ static void supercap_worker(struct work_struct *ignored)
 	if (supercap.pid > 0) {
 		vpid = find_vpid(supercap.pid);
 	}
+
     if (vpid) {
         if (running_on_cap == 0 && supercap.pwf_count == 0) {
             schedule_delayed_work(&supercap_work, SUPERCAP_CHECK_INTERVAL);
@@ -109,6 +112,8 @@ static void supercap_worker(struct work_struct *ignored)
         }
     } /* vpid */
 
+    mutex_unlock(&mts_io_mutex);
+
     schedule_delayed_work(&supercap_work, SUPERCAP_CHECK_INTERVAL);
 
 }
@@ -117,7 +122,7 @@ void init_supercap_worker(void) {
 	supercap_worker(NULL);
 }
 
-void cleanup_sepercap_worker(void) {
+void cleanup_supercap_worker(void) {
 	cancel_delayed_work_sync(&supercap_work);
 }
 
diff --git a/io-module/mts_supercap.h b/io-module/mts_supercap.h
index 79ea7df..871346d 100644
--- a/io-module/mts_supercap.h
+++ b/io-module/mts_supercap.h
@@ -28,7 +28,7 @@ typedef struct supercap_info {
 } supercap_info_t, *supercap_info_pt;
 
 extern void init_supercap_worker(void);
-extern void cleanup_sepercap_worker(void);
+extern void cleanup_supercap_worker(void);
 
 extern ssize_t mts_attr_show_supercap_monitor(struct device *dev,
 			       struct device_attribute *attr,
-- 
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