diff mbox series

opp: Don't decrement uninitialized list_kref

Message ID b7f4da2895bff6c96a43ffcfd685a2a74e7e878e.1562150899.git.viresh.kumar@linaro.org
State Accepted
Commit 11e1a1648298656722fe206a53e555e2e98668ae
Headers show
Series opp: Don't decrement uninitialized list_kref | expand

Commit Message

Viresh Kumar July 3, 2019, 10:48 a.m. UTC 
The list_kref was added for static OPPs and to track their users. The
kref is initialized while the static OPPs are added, but removed
unconditionally even if the static OPPs were never added. This causes
refcount mismatch warnings currently.

Fix that by always initializing the kref when the OPP table is first
initialized. The refcount is later incremented only for the second user
onwards.

Fixes: d0e8ae6c26da ("OPP: Create separate kref for static OPPs list")
Reported-and-tested-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

---
 drivers/opp/core.c |  1 +
 drivers/opp/of.c   | 21 ++++-----------------
 2 files changed, 5 insertions(+), 17 deletions(-)

-- 
2.21.0.rc0.269.g1a574e7a288b
diff mbox series

Patch

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 89ec6aa220cf..2958cc7bbb58 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -943,6 +943,7 @@  static struct opp_table *_allocate_opp_table(struct device *dev, int index)
 	BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head);
 	INIT_LIST_HEAD(&opp_table->opp_list);
 	kref_init(&opp_table->kref);
+	kref_init(&opp_table->list_kref);
 
 	/* Secure the device table modification */
 	list_add(&opp_table->node, &opp_tables);
diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index a637f30552a3..bf62b357437c 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -665,8 +665,6 @@  static int _of_add_opp_table_v2(struct device *dev, struct opp_table *opp_table)
 		return 0;
 	}
 
-	kref_init(&opp_table->list_kref);
-
 	/* We have opp-table node now, iterate over it and add OPPs */
 	for_each_available_child_of_node(opp_table->np, np) {
 		opp = _opp_add_static_v2(opp_table, dev, np);
@@ -675,17 +673,15 @@  static int _of_add_opp_table_v2(struct device *dev, struct opp_table *opp_table)
 			dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
 				ret);
 			of_node_put(np);
-			goto put_list_kref;
+			return ret;
 		} else if (opp) {
 			count++;
 		}
 	}
 
 	/* There should be one of more OPP defined */
-	if (WARN_ON(!count)) {
-		ret = -ENOENT;
-		goto put_list_kref;
-	}
+	if (WARN_ON(!count))
+		return -ENOENT;
 
 	list_for_each_entry(opp, &opp_table->opp_list, node)
 		pstate_count += !!opp->pstate;
@@ -694,8 +690,7 @@  static int _of_add_opp_table_v2(struct device *dev, struct opp_table *opp_table)
 	if (pstate_count && pstate_count != count) {
 		dev_err(dev, "Not all nodes have performance state set (%d: %d)\n",
 			count, pstate_count);
-		ret = -ENOENT;
-		goto put_list_kref;
+		return -ENOENT;
 	}
 
 	if (pstate_count)
@@ -704,11 +699,6 @@  static int _of_add_opp_table_v2(struct device *dev, struct opp_table *opp_table)
 	opp_table->parsed_static_opps = true;
 
 	return 0;
-
-put_list_kref:
-	_put_opp_list_kref(opp_table);
-
-	return ret;
 }
 
 /* Initializes OPP tables based on old-deprecated bindings */
@@ -734,8 +724,6 @@  static int _of_add_opp_table_v1(struct device *dev, struct opp_table *opp_table)
 		return -EINVAL;
 	}
 
-	kref_init(&opp_table->list_kref);
-
 	val = prop->value;
 	while (nr) {
 		unsigned long freq = be32_to_cpup(val++) * 1000;
@@ -745,7 +733,6 @@  static int _of_add_opp_table_v1(struct device *dev, struct opp_table *opp_table)
 		if (ret) {
 			dev_err(dev, "%s: Failed to add OPP %ld (%d)\n",
 				__func__, freq, ret);
-			_put_opp_list_kref(opp_table);
 			return ret;
 		}
 		nr -= 2;