950-0442-staging-vchiq-mmal-Fix-memory-leak-of-vchiq-instance.patch

From 3e246d402582c6f19e5e636f89952d11e18e6442 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Fri, 3 May 2019 13:27:51 +0100
Subject: [PATCH] staging: vchiq-mmal: Fix memory leak of vchiq
 instance

The vchiq instance was allocated from vchiq_mmal_init via
vchi_initialise, but was never released with vchi_disconnect.

Retain the handle and release it from vchiq_mmal_finalise.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
 drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
+++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
@@ -176,6 +176,7 @@ struct mmal_msg_context {
 };
 
 struct vchiq_mmal_instance {
+	VCHI_INSTANCE_T vchi_instance;
 	VCHI_SERVICE_HANDLE_T handle;
 
 	/* ensure serialised access to service */
@@ -1981,7 +1982,7 @@ EXPORT_SYMBOL_GPL(vchiq_mmal_component_i
 int vchiq_mmal_component_finalise(struct vchiq_mmal_instance *instance,
 				  struct vchiq_mmal_component *component)
 {
-	int ret, idx;
+	int ret;
 
 	if (mutex_lock_interruptible(&instance->vchiq_mutex))
 		return -EINTR;
@@ -2094,6 +2095,8 @@ int vchiq_mmal_finalise(struct vchiq_mma
 
 	idr_destroy(&instance->context_map);
 
+	vchi_disconnect(instance->vchi_instance);
+
 	kfree(instance);
 
 	return status;
@@ -2105,7 +2108,7 @@ int vchiq_mmal_init(struct vchiq_mmal_in
 	int status;
 	struct vchiq_mmal_instance *instance;
 	static VCHI_CONNECTION_T *vchi_connection;
-	static VCHI_INSTANCE_T vchi_instance;
+	VCHI_INSTANCE_T vchi_instance;
 	SERVICE_CREATION_T params = {
 		.version		= VCHI_VERSION_EX(VC_MMAL_VER, VC_MMAL_MIN_VER),
 		.service_id		= VC_MMAL_SERVER_NAME,
@@ -2151,6 +2154,8 @@ int vchiq_mmal_init(struct vchiq_mmal_in
 	if (!instance)
 		return -ENOMEM;
 
+	instance->vchi_instance = vchi_instance;
+
 	mutex_init(&instance->vchiq_mutex);
 
 	instance->bulk_scratch = vmalloc(PAGE_SIZE);