From: Niklas Cassel niklas.cassel@linaro.org
[ Upstream commit fffe7f52eb5db41eedadba9a8038e982dcfaee0c ]
For of_find_node_by_name(), you typically pass what the previous call returned. Therefore, of_find_node_by_name() increases the refcount of the returned node, and decreases the refcount of the node passed as the first argument.
of_find_node_by_name() is incorrectly used, and produces a warning. Fix the warning by using the more suitable function of_get_child_by_name().
Also add a missing of_node_put() for the returned value, since this was previously being leaked.
OF: ERROR: Bad of_node_put() on /soc/qcom,spmi@400f000/pmic@3/regulators CPU: 1 PID: 1 Comm: swapper/0 Tainted: G W 4.18.0-rc4-00223-gefd7b360b70e #12 Hardware name: Qualcomm Technologies, Inc. DB820c (DT) Call trace: dump_backtrace+0x0/0x1a8 show_stack+0x14/0x20 dump_stack+0x90/0xb4 of_node_release+0x74/0x78 kobject_put+0x90/0x1f0 of_node_put+0x14/0x20 of_find_node_by_name+0x80/0xd8 qcom_spmi_regulator_probe+0x30c/0x508
Fixes: 0caecaa87202 ("regulator: qcom_spmi: Add support for SAW") Signed-off-by: Niklas Cassel niklas.cassel@linaro.org Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- drivers/regulator/qcom_spmi-regulator.c | 32 +++++++++++++++---------- 1 file changed, 20 insertions(+), 12 deletions(-)
diff --git a/drivers/regulator/qcom_spmi-regulator.c b/drivers/regulator/qcom_spmi-regulator.c index 8d5cd624b4b8..ba3d5e63ada6 100644 --- a/drivers/regulator/qcom_spmi-regulator.c +++ b/drivers/regulator/qcom_spmi-regulator.c @@ -1752,7 +1752,8 @@ static int qcom_spmi_regulator_probe(struct platform_device *pdev) const char *name; struct device *dev = &pdev->dev; struct device_node *node = pdev->dev.of_node; - struct device_node *syscon; + struct device_node *syscon, *reg_node; + struct property *reg_prop; int ret, lenp; struct list_head *vreg_list;
@@ -1780,10 +1781,13 @@ static int qcom_spmi_regulator_probe(struct platform_device *pdev)
for (reg = match->data; reg->name; reg++) {
- if (saw_regmap && \ - of_find_property(of_find_node_by_name(node, reg->name), \ - "qcom,saw-slave", &lenp)) { - continue; + if (saw_regmap) { + reg_node = of_get_child_by_name(node, reg->name); + reg_prop = of_find_property(reg_node, "qcom,saw-slave", + &lenp); + of_node_put(reg_node); + if (reg_prop) + continue; }
vreg = devm_kzalloc(dev, sizeof(*vreg), GFP_KERNEL); @@ -1816,13 +1820,17 @@ static int qcom_spmi_regulator_probe(struct platform_device *pdev) if (ret) continue;
- if (saw_regmap && \ - of_find_property(of_find_node_by_name(node, reg->name), \ - "qcom,saw-leader", &lenp)) { - spmi_saw_ops = *(vreg->desc.ops); - spmi_saw_ops.set_voltage_sel = \ - spmi_regulator_saw_set_voltage; - vreg->desc.ops = &spmi_saw_ops; + if (saw_regmap) { + reg_node = of_get_child_by_name(node, reg->name); + reg_prop = of_find_property(reg_node, "qcom,saw-leader", + &lenp); + of_node_put(reg_node); + if (reg_prop) { + spmi_saw_ops = *(vreg->desc.ops); + spmi_saw_ops.set_voltage_sel = + spmi_regulator_saw_set_voltage; + vreg->desc.ops = &spmi_saw_ops; + } }
config.dev = dev;