SYSLINK: ipc - fix issues with nameserver_get functions

This patch fixes multiple issues with the nameserver_get and related
functions. The patch includes the following main changes.
	- nameserver_remote_get function is called only for valid
		remote notify handles in nameserver_get. Additional
		error checks have also been added.
	- Additional WARN_ONs and error checks have been added for
		input arguments in nameserver_remote_get function.
	- nameserver_remotenotify_message structure misalignment has
		been fixed. This issue is causing the remote processor
		to return wrong values when queried.
	- Additional error check has been added to ensure that there
		is a valid buffer to copy after receiving a response
		from the remote processor in nameserver_remotenotify_get
		function.
Signed-off-by: Suman Anna <s-anna@ti.com>

drivers/dsp/syslink/multicore_ipc/nameserver.c

@@ -856,6 +856,9 @@ int nameserver_get(void *handle, const char *name,
 			if (i == local_proc_id)
 				continue;
 
+			if (nameserver_state.remote_handle_list[i] == NULL)
+				continue;
+
 			retval = nameserver_remote_get(
 					nameserver_state.remote_handle_list[i],
 					temp_obj->name, name, buffer, length);
@@ -888,7 +891,8 @@ int nameserver_get(void *handle, const char *name,
 	}
 
 exit:
-	printk(KERN_ERR "nameserver_get status:%x \n", retval);
+	if (retval < 0)
+		printk(KERN_ERR "nameserver_get failed: status=%x \n", retval);
 	return retval;
 }
 EXPORT_SYMBOL(nameserver_get);

drivers/dsp/syslink/multicore_ipc/nameserver_remote.c

@@ -30,7 +30,13 @@ int nameserver_remote_get(const struct nameserver_remote_object *handle,
 {
 	s32 retval = 0;
 
-	if (WARN_ON(instance_name == NULL)) {
+	if (handle == NULL) {
+		retval = -EINVAL;
+		goto exit;
+	}
+
+	if (WARN_ON((instance_name == NULL) || (name == NULL)
+		|| (value == NULL))) {
 		retval = -EINVAL;
 		goto exit;
 	}

drivers/dsp/syslink/multicore_ipc/nameserver_remotenotify.c

@@ -65,7 +65,6 @@ struct nameserver_remotenotify_message {
 	u32 request;
 	u32 response;
 	u32 request_status;
-	u32 response_status;
 	u32 value;
 	u32 value_len;
 	char instance_name[32];
@@ -369,13 +368,16 @@ int nameserver_remotenotify_get(void *rhandle,
 		goto exit;
 	}
 
+	if (!value_len) {
+		retval = -ENOENT;
+		goto exit;
+	}
+
 	if (value_len == sizeof(u32))
-		memcpy((void *)value,
-			(void *) &(obj->msg[offset]->value),
+		memcpy((void *)value, (void *) &(obj->msg[offset]->value),
 			sizeof(u32));
 	else
-		memcpy((void *)value,
-			(void *)&(obj->msg[offset]->value_buf),
+		memcpy((void *)value, (void *)&(obj->msg[offset]->value_buf),
 			value_len);
 
 	obj->msg[offset]->request_status = false;