staging: vchi: Get rid of struct vchi_instance_handle

The idea behind this was to create an opaque handle to struct
vchiq_instance. This can be achieved without creating a new type by
means of a forward declaration of struct vchiq_instance.

This saves us from a lot of useless casting and overall simplifies code.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/20200629150945.10720-12-nsaenzjulienne@suse.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c

@@ -122,7 +122,7 @@ static void audio_vchi_callback(void *param,
 }
 
 static int
-vc_vchi_audio_init(struct vchi_instance_handle *vchi_instance,
+vc_vchi_audio_init(struct vchiq_instance *vchiq_instance,
 		   struct bcm2835_audio_instance *instance)
 {
 	struct service_creation params = {
@@ -134,7 +134,7 @@ vc_vchi_audio_init(struct vchi_instance_handle *vchi_instance,
 	int status;
 
 	/* Open the VCHI service connections */
-	status = vchi_service_open(vchi_instance, &params,
+	status = vchi_service_open(vchiq_instance, &params,
 				   &instance->vchi_handle);
 
 	if (status) {
@@ -173,20 +173,20 @@ int bcm2835_new_vchi_ctx(struct device *dev, struct bcm2835_vchi_ctx *vchi_ctx)
 	int ret;
 
 	/* Initialize and create a VCHI connection */
-	ret = vchi_initialise(&vchi_ctx->vchi_instance);
+	ret = vchi_initialise(&vchi_ctx->instance);
 	if (ret) {
 		dev_err(dev, "failed to initialise VCHI instance (ret=%d)\n",
 			ret);
 		return -EIO;
 	}
 
-	ret = vchi_connect(vchi_ctx->vchi_instance);
+	ret = vchi_connect(vchi_ctx->instance);
 	if (ret) {
 		dev_dbg(dev, "failed to connect VCHI instance (ret=%d)\n",
 			ret);
 
-		kfree(vchi_ctx->vchi_instance);
-		vchi_ctx->vchi_instance = NULL;
+		kfree(vchi_ctx->instance);
+		vchi_ctx->instance = NULL;
 
 		return -EIO;
 	}
@@ -196,10 +196,10 @@ int bcm2835_new_vchi_ctx(struct device *dev, struct bcm2835_vchi_ctx *vchi_ctx)
 
 void bcm2835_free_vchi_ctx(struct bcm2835_vchi_ctx *vchi_ctx)
 {
-	/* Close the VCHI connection - it will also free vchi_instance */
-	WARN_ON(vchi_disconnect(vchi_ctx->vchi_instance));
+	/* Close the VCHI connection - it will also free vchi_ctx->instance */
+	WARN_ON(vchi_disconnect(vchi_ctx->instance));
 
-	vchi_ctx->vchi_instance = NULL;
+	vchi_ctx->instance = NULL;
 }
 
 int bcm2835_audio_open(struct bcm2835_alsa_stream *alsa_stream)
@@ -217,7 +217,7 @@ int bcm2835_audio_open(struct bcm2835_alsa_stream *alsa_stream)
 	instance->alsa_stream = alsa_stream;
 	alsa_stream->instance = instance;
 
-	err = vc_vchi_audio_init(vchi_ctx->vchi_instance,
+	err = vc_vchi_audio_init(vchi_ctx->instance,
 				 instance);
 	if (err < 0)
 		goto free_instance;

drivers/staging/vc04_services/bcm2835-audio/bcm2835.h

@@ -44,7 +44,7 @@ enum snd_bcm2835_ctrl {
 };
 
 struct bcm2835_vchi_ctx {
-	struct vchi_instance_handle *vchi_instance;
+	struct vchiq_instance *instance;
 };
 
 /* definition of the chip-specific record */

drivers/staging/vc04_services/interface/vchi/vchi.h

@@ -49,8 +49,8 @@ struct service_creation {
 	void *callback_param;
 };
 
-// Opaque handle for a VCHI instance
-struct vchi_instance_handle;
+// Opaque handle for a VCHIQ instance
+struct vchiq_instance;
 
 // Opaque handle for a server or client
 struct vchi_service_handle;
@@ -61,19 +61,19 @@ struct vchi_service_handle;
  *****************************************************************************/
 
 // Routine used to initialise the vchi on both local + remote connections
-extern int32_t vchi_initialise(struct vchi_instance_handle **instance_handle);
+extern int32_t vchi_initialise(struct vchiq_instance **instance);
 
-extern int32_t vchi_connect(struct vchi_instance_handle *instance_handle);
+extern int32_t vchi_connect(struct vchiq_instance *instance);
 
 //When this is called, ensure that all services have no data pending.
 //Bulk transfers can remain 'queued'
-extern int32_t vchi_disconnect(struct vchi_instance_handle *instance_handle);
+extern int32_t vchi_disconnect(struct vchiq_instance *instance);
 
 /******************************************************************************
  * Global service API
  *****************************************************************************/
 // Routine to open a named service
-extern int32_t vchi_service_open(struct vchi_instance_handle *instance_handle,
+extern int32_t vchi_service_open(struct vchiq_instance *instance,
 				 struct service_creation *setup,
 				 struct vchi_service_handle **handle);
 

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

@@ -287,7 +287,7 @@ EXPORT_SYMBOL(vchi_msg_hold);
 /***********************************************************
  * Name: vchi_initialise
  *
- * Arguments: struct vchi_instance_handle **instance_handle
+ * Arguments: struct vchiq_instance **instance
  *
  * Description: Initialises the hardware but does not transmit anything
  *              When run as a Host App this will be called twice hence the need
@@ -297,23 +297,16 @@ EXPORT_SYMBOL(vchi_msg_hold);
  *
  ***********************************************************/
 
-int32_t vchi_initialise(struct vchi_instance_handle **instance_handle)
+int32_t vchi_initialise(struct vchiq_instance **instance)
 {
-	struct vchiq_instance *instance;
-	enum vchiq_status status;
-
-	status = vchiq_initialise(&instance);
-
-	*instance_handle = (struct vchi_instance_handle *)instance;
-
-	return status;
+	return vchiq_initialise(instance);
 }
 EXPORT_SYMBOL(vchi_initialise);
 
 /***********************************************************
  * Name: vchi_connect
  *
- * Arguments: struct vchi_instance_handle *instance_handle
+ * Arguments: struct vchiq_instance *instance
  *
  * Description: Starts the command service on each connection,
  *              causing INIT messages to be pinged back and forth
@@ -321,10 +314,8 @@ EXPORT_SYMBOL(vchi_initialise);
  * Returns: 0 if successful, failure otherwise
  *
  ***********************************************************/
-int32_t vchi_connect(struct vchi_instance_handle *instance_handle)
+int32_t vchi_connect(struct vchiq_instance *instance)
 {
-	struct vchiq_instance *instance = (struct vchiq_instance *)instance_handle;
-
 	return vchiq_connect(instance);
 }
 EXPORT_SYMBOL(vchi_connect);
@@ -332,7 +323,7 @@ EXPORT_SYMBOL(vchi_connect);
 /***********************************************************
  * Name: vchi_disconnect
  *
- * Arguments: struct vchi_instance_handle *instance_handle
+ * Arguments: struct vchiq_instance *instance
  *
  * Description: Stops the command service on each connection,
  *              causing DE-INIT messages to be pinged back and forth
@@ -340,10 +331,8 @@ EXPORT_SYMBOL(vchi_connect);
  * Returns: 0 if successful, failure otherwise
  *
  ***********************************************************/
-int32_t vchi_disconnect(struct vchi_instance_handle *instance_handle)
+int32_t vchi_disconnect(struct vchiq_instance *instance)
 {
-	struct vchiq_instance *instance = (struct vchiq_instance *)instance_handle;
-
 	return vchiq_shutdown(instance);
 }
 EXPORT_SYMBOL(vchi_disconnect);
@@ -352,7 +341,7 @@ EXPORT_SYMBOL(vchi_disconnect);
  * Name: vchi_service_open
  * Name: vchi_service_create
  *
- * Arguments: struct vchi_instance_handle *instance_handle
+ * Arguments: struct vchiq_instance *instance
  *            struct service_creation *setup,
  *            struct vchi_service_handle **handle
  *
@@ -446,11 +435,10 @@ static void service_free(struct shim_service *service)
 	}
 }
 
-int32_t vchi_service_open(struct vchi_instance_handle *instance_handle,
+int32_t vchi_service_open(struct vchiq_instance *instance,
 	struct service_creation *setup,
 	struct vchi_service_handle **handle)
 {
-	struct vchiq_instance *instance = (struct vchiq_instance *)instance_handle;
 	struct shim_service *service = service_alloc(instance, setup);
 
 	*handle = (struct vchi_service_handle *)service;

drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c

@@ -1864,7 +1864,7 @@ int vchiq_mmal_init(struct vchiq_mmal_instance **out_instance)
 {
 	int status;
 	struct vchiq_mmal_instance *instance;
-	static struct vchi_instance_handle *vchi_instance;
+	static struct vchiq_instance *vchiq_instance;
 	struct service_creation params = {
 		.version		= VCHI_VERSION_EX(VC_MMAL_VER, VC_MMAL_MIN_VER),
 		.service_id		= VC_MMAL_SERVER_NAME,
@@ -1886,14 +1886,14 @@ int vchiq_mmal_init(struct vchiq_mmal_instance **out_instance)
 	BUILD_BUG_ON(sizeof(struct mmal_port) != 64);
 
 	/* create a vchi instance */
-	status = vchi_initialise(&vchi_instance);
+	status = vchi_initialise(&vchiq_instance);
 	if (status) {
 		pr_err("Failed to initialise VCHI instance (status=%d)\n",
 		       status);
 		return -EIO;
 	}
 
-	status = vchi_connect(vchi_instance);
+	status = vchi_connect(vchiq_instance);
 	if (status) {
 		pr_err("Failed to connect VCHI instance (status=%d)\n", status);
 		return -EIO;
@@ -1918,7 +1918,7 @@ int vchiq_mmal_init(struct vchiq_mmal_instance **out_instance)
 	if (!instance->bulk_wq)
 		goto err_free;
 
-	status = vchi_service_open(vchi_instance, &params, &instance->handle);
+	status = vchi_service_open(vchiq_instance, &params, &instance->handle);
 	if (status) {
 		pr_err("Failed to open VCHI service connection (status=%d)\n",
 		       status);