staging: vchiq_arm: pass vchiq instance to 'handle_to_service'

In order to remove the 'vchiq_states' global array, we need to pass the
vchiq_instance reference to the 'handle_to_service' function. This will
allow accessing the vchiq state through the vchiq instance instead of
through the global array.
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Adrien Thierry <athierry@redhat.com>
Link: https://lore.kernel.org/r/20220518191126.60396-8-athierry@redhat.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c

@@ -1059,7 +1059,7 @@ service_callback(struct vchiq_instance *instance, enum vchiq_reason reason,
 	DEBUG_TRACE(SERVICE_CALLBACK_LINE);
 
 	rcu_read_lock();
-	service = handle_to_service(handle);
+	service = handle_to_service(instance, handle);
 	if (WARN_ON(!service)) {
 		rcu_read_unlock();
 		return VCHIQ_SUCCESS;

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c

@@ -240,7 +240,7 @@ find_service_by_handle(struct vchiq_instance *instance, unsigned int handle)
 	struct vchiq_service *service;
 
 	rcu_read_lock();
-	service = handle_to_service(handle);
+	service = handle_to_service(instance, handle);
 	if (service && service->srvstate != VCHIQ_SRVSTATE_FREE &&
 	    service->handle == handle &&
 	    kref_get_unless_zero(&service->ref_count)) {
@@ -281,7 +281,7 @@ find_service_for_instance(struct vchiq_instance *instance, unsigned int handle)
 	struct vchiq_service *service;
 
 	rcu_read_lock();
-	service = handle_to_service(handle);
+	service = handle_to_service(instance, handle);
 	if (service && service->srvstate != VCHIQ_SRVSTATE_FREE &&
 	    service->handle == handle &&
 	    service->instance == instance &&
@@ -302,7 +302,7 @@ find_closed_service_for_instance(struct vchiq_instance *instance, unsigned int h
 	struct vchiq_service *service;
 
 	rcu_read_lock();
-	service = handle_to_service(handle);
+	service = handle_to_service(instance, handle);
 	if (service &&
 	    (service->srvstate == VCHIQ_SRVSTATE_FREE ||
 	     service->srvstate == VCHIQ_SRVSTATE_CLOSED) &&
@@ -404,7 +404,7 @@ vchiq_get_client_id(struct vchiq_instance *instance, unsigned int handle)
 	int id;
 
 	rcu_read_lock();
-	service = handle_to_service(handle);
+	service = handle_to_service(instance, handle);
 	id = service ? service->client_id : 0;
 	rcu_read_unlock();
 	return id;
@@ -417,7 +417,7 @@ vchiq_get_service_userdata(struct vchiq_instance *instance, unsigned int handle)
 	struct vchiq_service *service;
 
 	rcu_read_lock();
-	service = handle_to_service(handle);
+	service = handle_to_service(instance, handle);
 	userdata = service ? service->base.userdata : NULL;
 	rcu_read_unlock();
 	return userdata;

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h

@@ -509,7 +509,7 @@ request_poll(struct vchiq_state *state, struct vchiq_service *service,
 	     int poll_type);
 
 static inline struct vchiq_service *
-handle_to_service(unsigned int handle)
+handle_to_service(struct vchiq_instance *instance, unsigned int handle)
 {
 	int idx = handle & (VCHIQ_MAX_SERVICES - 1);
 	struct vchiq_state *state = vchiq_states[(handle / VCHIQ_MAX_SERVICES) &