[patch 23/38] CKRM e18: Fix edge cases with empty lists and rule deletion

[Gerrit Huizenga <gh@us.ibm.com>]

Fix rule re-insertion to be more careful with empty lists.
Fix rule deletion to not delete rules that are still in a list.

Signed-Off-By: Matt Helsley <matthltc@us.ibm.com>
Signed-Off-By: Gerrit Huizenga <gh@us.ibm.com>

Index: linux-2.6.12-ckrm1/kernel/ckrm/rbce/rbce_main.c
===================================================================
--- linux-2.6.12-ckrm1.orig/kernel/ckrm/rbce/rbce_main.c	2005-06-20 15:04:28.000000000 -0700
+++ linux-2.6.12-ckrm1/kernel/ckrm/rbce/rbce_main.c	2005-06-20 15:04:48.000000000 -0700
@@ -162,8 +162,8 @@ static int insert_rule(struct rbce_rule 
 			}
 		}
 	}
-	if (type == REINSERT)
-		list_del(&rule->obj.link);
+	if ((type == REINSERT) && !list_empty(&rule->obj.link))
+		list_del_init(&rule->obj.link);
 	else {
 		/*  protect the module from removed if a rule exists */
 		try_module_get(THIS_MODULE);
@@ -340,12 +340,14 @@ static void __release_rule(struct rbce_r
 static inline int __delete_rule(struct rbce_rule *rule)
 {
 	/* make sure we are not referenced by other rules */
+	if (list_empty(&rule->obj.link))
+		return 0;
 	if (GET_REF(rule))
 		return -EBUSY;
 	__release_rule(rule);
 	put_class(rule->target_class);
 	release_term_index(rule->index);
-	list_del(&rule->obj.link);
+	list_del_init(&rule->obj.link);
 	gl_num_rules--;
 	gl_rules_version++;
 	module_put(THIS_MODULE);

--
-
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