firmware: arm_scmi: Make references to handle const

Now that all the protocol private variable data have been moved out of
struct scmi_handle, mark all of its references as const.

Link: https://lore.kernel.org/r/20210316124903.35011-32-cristian.marussi@arm.comTested-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

drivers/firmware/arm_scmi/common.h

@@ -276,8 +276,8 @@ void __exit scmi_##name##_unregister(void)			\
 
 const struct scmi_protocol *scmi_protocol_get(int protocol_id);
 
-int scmi_protocol_acquire(struct scmi_handle *handle, u8 protocol_id);
-void scmi_protocol_release(struct scmi_handle *handle, u8 protocol_id);
+int scmi_protocol_acquire(const struct scmi_handle *handle, u8 protocol_id);
+void scmi_protocol_release(const struct scmi_handle *handle, u8 protocol_id);
 
 /* SCMI Transport */
 /**

drivers/firmware/arm_scmi/driver.c

@@ -739,7 +739,7 @@ scmi_alloc_init_protocol_instance(struct scmi_info *info,
 	int ret = -ENOMEM;
 	void *gid;
 	struct scmi_protocol_instance *pi;
-	struct scmi_handle *handle = &info->handle;
+	const struct scmi_handle *handle = &info->handle;
 
 	/* Protocol specific devres group */
 	gid = devres_open_group(handle->dev, NULL, GFP_KERNEL);
@@ -805,7 +805,7 @@ scmi_alloc_init_protocol_instance(struct scmi_info *info,
  * Return: A reference to an initialized protocol instance or error on failure.
  */
 static struct scmi_protocol_instance * __must_check
-scmi_get_protocol_instance(struct scmi_handle *handle, u8 protocol_id)
+scmi_get_protocol_instance(const struct scmi_handle *handle, u8 protocol_id)
 {
 	struct scmi_protocol_instance *pi;
 	struct scmi_info *info = handle_to_scmi_info(handle);
@@ -840,7 +840,7 @@ scmi_get_protocol_instance(struct scmi_handle *handle, u8 protocol_id)
  *
  * Return: 0 if protocol was acquired successfully.
  */
-int scmi_protocol_acquire(struct scmi_handle *handle, u8 protocol_id)
+int scmi_protocol_acquire(const struct scmi_handle *handle, u8 protocol_id)
 {
 	return PTR_ERR_OR_ZERO(scmi_get_protocol_instance(handle, protocol_id));
 }
@@ -853,7 +853,7 @@ int scmi_protocol_acquire(struct scmi_handle *handle, u8 protocol_id)
  * Remove one user for the specified protocol and triggers de-initialization
  * and resources de-allocation once the last user has gone.
  */
-void scmi_protocol_release(struct scmi_handle *handle, u8 protocol_id)
+void scmi_protocol_release(const struct scmi_handle *handle, u8 protocol_id)
 {
 	struct scmi_info *info = handle_to_scmi_info(handle);
 	struct scmi_protocol_instance *pi;
@@ -908,7 +908,7 @@ scmi_is_protocol_implemented(const struct scmi_handle *handle, u8 prot_id)
 }
 
 struct scmi_protocol_devres {
-	struct scmi_handle *handle;
+	const struct scmi_handle *handle;
 	u8 protocol_id;
 };