rv: Convert to use __free

Convert to use __free to tidy up the code.

Signed-off-by: Nam Cao <[e-mail]>
Reviewed-by: Gabriele Monaco <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Gabriele Monaco <[e-mail]>

kernel/trace/rv/rv.c

···
 static int create_monitor_dir(struct rv_monitor *mon, struct rv_monitor *parent)
 {
 	struct dentry *root = parent ? parent->root_d : get_monitors_root();
-	const char *name = mon->name;
+	struct dentry *dir __free(rv_remove) = rv_create_dir(mon->name, root);
 	struct dentry *tmp;
 	int retval;
 
-	mon->root_d = rv_create_dir(name, root);
-	if (!mon->root_d)
+	if (!dir)
 		return -ENOMEM;
 
-	tmp = rv_create_file("enable", RV_MODE_WRITE, mon->root_d, mon, &interface_enable_fops);
-	if (!tmp) {
-		retval = -ENOMEM;
-		goto out_remove_root;
-	}
+	tmp = rv_create_file("enable", RV_MODE_WRITE, dir, mon, &interface_enable_fops);
+	if (!tmp)
+		return -ENOMEM;
 
-	tmp = rv_create_file("desc", RV_MODE_READ, mon->root_d, mon, &interface_desc_fops);
-	if (!tmp) {
-		retval = -ENOMEM;
-		goto out_remove_root;
-	}
+	tmp = rv_create_file("desc", RV_MODE_READ, dir, mon, &interface_desc_fops);
+	if (!tmp)
+		return -ENOMEM;
 
-	retval = reactor_populate_monitor(mon);
+	retval = reactor_populate_monitor(mon, dir);
 	if (retval)
-		goto out_remove_root;
+		return retval;
 
+	mon->root_d = no_free_ptr(dir);
 	return 0;
-
-out_remove_root:
-	rv_remove(mon->root_d);
-	return retval;
 }
 
 /*
···
 {
 	struct dentry *tmp;
 	int retval;
+	struct dentry *root_dir __free(rv_remove) = rv_create_dir("rv", NULL);
 
-	rv_root.root_dir = rv_create_dir("rv", NULL);
-	if (!rv_root.root_dir)
-		goto out_err;
+	if (!root_dir)
+		return 1;
 
-	rv_root.monitors_dir = rv_create_dir("monitors", rv_root.root_dir);
+	rv_root.monitors_dir = rv_create_dir("monitors", root_dir);
 	if (!rv_root.monitors_dir)
-		goto out_err;
+		return 1;
 
-	tmp = rv_create_file("available_monitors", RV_MODE_READ, rv_root.root_dir, NULL,
+	tmp = rv_create_file("available_monitors", RV_MODE_READ, root_dir, NULL,
 			     &available_monitors_ops);
 	if (!tmp)
-		goto out_err;
+		return 1;
 
-	tmp = rv_create_file("enabled_monitors", RV_MODE_WRITE, rv_root.root_dir, NULL,
+	tmp = rv_create_file("enabled_monitors", RV_MODE_WRITE, root_dir, NULL,
 			     &enabled_monitors_ops);
 	if (!tmp)
-		goto out_err;
+		return 1;
 
-	tmp = rv_create_file("monitoring_on", RV_MODE_WRITE, rv_root.root_dir, NULL,
+	tmp = rv_create_file("monitoring_on", RV_MODE_WRITE, root_dir, NULL,
 			     &monitoring_on_fops);
 	if (!tmp)
-		goto out_err;
-	retval = init_rv_reactors(rv_root.root_dir);
+		return 1;
+	retval = init_rv_reactors(root_dir);
 	if (retval)
-		goto out_err;
+		return 1;
 
 	turn_monitoring_on();
 
-	return 0;
+	rv_root.root_dir = no_free_ptr(root_dir);
 
-out_err:
-	rv_remove(rv_root.root_dir);
-	printk(KERN_ERR "RV: Error while creating the RV interface\n");
-	return 1;
+	return 0;
 }

kernel/trace/rv/rv.h

···
 #define rv_create_file			tracefs_create_file
 #define rv_remove			tracefs_remove
 
+DEFINE_FREE(rv_remove, struct dentry *, if (_T) rv_remove(_T));
+
 #define MAX_RV_MONITOR_NAME_SIZE	32
 #define MAX_RV_REACTOR_NAME_SIZE	32
 
···
 bool rv_is_nested_monitor(struct rv_monitor *mon);
 
 #ifdef CONFIG_RV_REACTORS
-int reactor_populate_monitor(struct rv_monitor *mon);
+int reactor_populate_monitor(struct rv_monitor *mon, struct dentry *root);
 int init_rv_reactors(struct dentry *root_dir);
 #else
-static inline int reactor_populate_monitor(struct rv_monitor *mon)
+static inline int reactor_populate_monitor(struct rv_monitor *mon, struct dentry *root)
 {
 	return 0;
 }

kernel/trace/rv/rv_reactors.c

···
 /**
  * reactor_populate_monitor - creates per monitor reactors file
  * @mon:	The monitor.
+ * @root:	The directory of the monitor.
  *
  * Returns 0 if successful, error otherwise.
  */
-int reactor_populate_monitor(struct rv_monitor *mon)
+int reactor_populate_monitor(struct rv_monitor *mon, struct dentry *root)
 {
 	struct dentry *tmp;
 
-	tmp = rv_create_file("reactors", RV_MODE_WRITE, mon->root_d, mon, &monitor_reactors_ops);
+	tmp = rv_create_file("reactors", RV_MODE_WRITE, root, mon, &monitor_reactors_ops);
 	if (!tmp)
 		return -ENOMEM;
 
···
 
 int init_rv_reactors(struct dentry *root_dir)
 {
-	struct dentry *available, *reacting;
 	int retval;
 
-	available = rv_create_file("available_reactors", RV_MODE_READ, root_dir, NULL,
-				   &available_reactors_ops);
-	if (!available)
-		goto out_err;
+	struct dentry *available __free(rv_remove) =
+		rv_create_file("available_reactors", RV_MODE_READ, root_dir,
+				NULL, &available_reactors_ops);
 
-	reacting = rv_create_file("reacting_on", RV_MODE_WRITE, root_dir, NULL, &reacting_on_fops);
-	if (!reacting)
-		goto rm_available;
+	struct dentry *reacting __free(rv_remove) =
+		rv_create_file("reacting_on", RV_MODE_WRITE, root_dir, NULL, &reacting_on_fops);
+
+	if (!reacting || !available)
+		return -ENOMEM;
 
 	retval = __rv_register_reactor(&rv_nop);
 	if (retval)
-		goto rm_reacting;
+		return retval;
 
 	turn_reacting_on();
 
+	retain_and_null_ptr(available);
+	retain_and_null_ptr(reacting);
 	return 0;
-
-rm_reacting:
-	rv_remove(reacting);
-rm_available:
-	rv_remove(available);
-out_err:
-	return -ENOMEM;
 }
 
 void rv_react(struct rv_monitor *monitor, const char *msg, ...)

kernel/trace/trace.c

···
 		tracer_init_tracefs_work_func(NULL);
 	}
 
-	rv_init_interface();
+	if (rv_init_interface())
+		pr_err("RV: Error while creating the RV interface\n");
 
 	return 0;
 }