From f94642597f63c71b2ccffddd4f447190c131af56 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Mon, 24 Sep 2018 16:51:13 +0100
Subject: [PATCH] staging: mmal-vchiq: Allocate and free components as
 required

The existing code assumed that there would only ever be 4 components,
and never freed the entries once used.
Allow arbitrary creation and destruction of components.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
 .../vc04_services/vchiq-mmal/mmal-vchiq.c     | 29 ++++++++++++-------
 .../vc04_services/vchiq-mmal/mmal-vchiq.h     |  1 +
 2 files changed, 20 insertions(+), 10 deletions(-)

--- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
+++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
@@ -38,8 +38,11 @@ MODULE_AUTHOR("Dave Stevenson, <dave.ste
 MODULE_LICENSE("GPL");
 MODULE_VERSION("0.0.1");
 
-/* maximum number of components supported */
-#define VCHIQ_MMAL_MAX_COMPONENTS 4
+/*
+ * maximum number of components supported.
+ * This matches the maximum permitted by default on the VPU
+ */
+#define VCHIQ_MMAL_MAX_COMPONENTS 64
 
 /*#define FULL_MSG_DUMP 1*/
 
@@ -174,8 +177,6 @@ struct vchiq_mmal_instance {
 	/* protect accesses to context_map */
 	struct mutex context_map_lock;
 
-	/* component to use next */
-	int component_idx;
 	struct vchiq_mmal_component component[VCHIQ_MMAL_MAX_COMPONENTS];
 
 	/* ordered workqueue to process all bulk operations */
@@ -1632,18 +1633,24 @@ int vchiq_mmal_component_init(struct vch
 {
 	int ret;
 	int idx;		/* port index */
-	struct vchiq_mmal_component *component;
+	struct vchiq_mmal_component *component = NULL;
 
 	if (mutex_lock_interruptible(&instance->vchiq_mutex))
 		return -EINTR;
 
-	if (instance->component_idx == VCHIQ_MMAL_MAX_COMPONENTS) {
+	for (idx = 0; idx < VCHIQ_MMAL_MAX_COMPONENTS; idx++) {
+		if (!instance->component[idx].in_use) {
+			component = &instance->component[idx];
+			component->in_use = 1;
+			break;
+		}
+	}
+
+	if (!component) {
 		ret = -EINVAL;	/* todo is this correct error? */
 		goto unlock;
 	}
 
-	component = &instance->component[instance->component_idx];
-
 	ret = create_component(instance, component, name);
 	if (ret < 0) {
 		pr_err("%s: failed to create component %d (Not enough GPU mem?)\n",
@@ -1694,8 +1701,6 @@ int vchiq_mmal_component_init(struct vch
 			goto release_component;
 	}
 
-	instance->component_idx++;
-
 	*component_out = component;
 
 	mutex_unlock(&instance->vchiq_mutex);
@@ -1705,6 +1710,8 @@ int vchiq_mmal_component_init(struct vch
 release_component:
 	destroy_component(instance, component);
 unlock:
+	if (component)
+		component->in_use = 0;
 	mutex_unlock(&instance->vchiq_mutex);
 
 	return ret;
@@ -1727,6 +1734,8 @@ int vchiq_mmal_component_finalise(struct
 
 	ret = destroy_component(instance, component);
 
+	component->in_use = 0;
+
 	mutex_unlock(&instance->vchiq_mutex);
 
 	return ret;
--- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.h
+++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.h
@@ -82,6 +82,7 @@ struct vchiq_mmal_port {
 };
 
 struct vchiq_mmal_component {
+	u32 in_use:1;
 	bool enabled;
 	u32 handle;  /* VideoCore handle for component */
 	u32 inputs;  /* Number of input ports */
