linux-kernel - [PATCH 6/8] dyndbg: ddebug_zpool

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Date:   Fri,  7 Aug 2020 14:09:54 -0600
From:   Jim Cromie <jim.cromie@...il.com>
To:     jbaron@...mai.com, linux-kernel@...r.kernel.org
Cc:     Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH 6/8] dyndbg: ddebug_zpool_remove

add ddebug_zpool_remove() to undo ddebug_zpool_add(), and call it from
ddebug_remove_module().

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 lib/dynamic_debug.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 049299027fb3..102f47b2a439 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -1007,6 +1007,18 @@ static void ddebug_zpool_add(struct _ddebug *dp)
 	zs_unmap_object(dd_callsite_zpool, handle);
 }
 
+static void ddebug_zpool_remove(struct _ddebug *dp)
+{
+	if (dp->site) {
+		pr_warn("zhandle shouldnt be mapped now\n");
+		zs_unmap_object(dd_callsite_zpool, dp->zhandle);
+	}
+	if (!dp->zhandle)
+		pr_err("zhandle already cleared !\n");
+	else
+		zs_free(dd_callsite_zpool, dp->zhandle);
+}
+
 /*
  * Allocate a new ddebug_table for the given module
  * and add it to the global list.
@@ -1104,6 +1116,13 @@ int ddebug_remove_module(const char *mod_name)
 	mutex_lock(&ddebug_lock);
 	list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) {
 		if (dt->mod_name == mod_name) {
+
+			unsigned int n = dt->num_ddebugs;
+			struct _ddebug *dp = dt->ddebugs;
+
+			for (; n; n--, dp++)
+				ddebug_zpool_remove(dp);
+
 			ddebug_table_free(dt);
 			ret = 0;
 			break;
-- 
2.26.2