From: Dragos Bogdan <dragos.bogdan@xxxxxxxxxx>
axi_fan_control_irq_handler(), dependent on the private
axi_fan_control_data structure, might be called before the hwmon
device is registered. That will cause an "Unable to handle kernel
NULL pointer dereference" error.
Fixes: 8412b41 ("hwmon: Support ADI Fan Control IP")
Signed-off-by: Dragos Bogdan <dragos.bogdan@xxxxxxxxxx>
Signed-off-by: Nuno Sa <nuno.sa@xxxxxxxxxx>
---
drivers/hwmon/axi-fan-control.c | 29 ++++++++++++++++-------------
1 file changed, 16 insertions(+), 13 deletions(-)
diff --git a/drivers/hwmon/axi-fan-control.c b/drivers/hwmon/axi-fan-control.c
index 5fd136baf1cd..19b9bf3d75ef 100644
--- a/drivers/hwmon/axi-fan-control.c
+++ b/drivers/hwmon/axi-fan-control.c
@@ -496,6 +496,21 @@ static int axi_fan_control_probe(struct platform_device *pdev)
return -ENODEV;
}
+ ret = axi_fan_control_init(ctl, pdev->dev.of_node);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to initialize device\n");
+ return ret;
+ }
+
+ ctl->hdev = devm_hwmon_device_register_with_info(&pdev->dev,
+ name,
+ ctl,
+ &axi_chip_info,
+ axi_fan_control_groups);
+
+ if (IS_ERR(ctl->hdev))
+ return PTR_ERR(ctl->hdev);
+
ctl->irq = platform_get_irq(pdev, 0);
if (ctl->irq < 0)
return ctl->irq;
@@ -509,19 +524,7 @@ static int axi_fan_control_probe(struct platform_device *pdev)
return ret;
}
- ret = axi_fan_control_init(ctl, pdev->dev.of_node);
- if (ret) {
- dev_err(&pdev->dev, "Failed to initialize device\n");
- return ret;
- }
-
- ctl->hdev = devm_hwmon_device_register_with_info(&pdev->dev,
- name,
- ctl,
- &axi_chip_info,
- axi_fan_control_groups);
-
- return PTR_ERR_OR_ZERO(ctl->hdev);
+ return 0;
}
static struct platform_driver axi_fan_control_driver = {
--
2.42.0
