[PATCH v1 07/11] thermal/drivers/bcm2835: Remove buggy call to thermal_of_zone_unregister

From: Daniel Lezcano
Date: Tue Mar 07 2023 - 08:38:22 EST


The driver is using the devm_thermal_of_zone_device_register().

In the error path of the function calling
devm_thermal_of_zone_device_register(), the function
devm_thermal_of_zone_unregister() should be called instead of
thermal_of_zone_unregister(), otherwise this one will be called twice
when the device is freed.

The same happens for the remove function where the devm_ guarantee the
thermal_of_zone_unregister() will be called, so adding this call in
the remove function will lead to a double free also.

Use devm_ variant in the error path of the probe function.

Remove thermal_of_zone_unregister() in the remove function.

Cc: Florian Fainelli <f.fainelli@xxxxxxxxx>
Cc: Ray Jui <rjui@xxxxxxxxxxxx>
Cc: Scott Branden <sbranden@xxxxxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
---
drivers/thermal/broadcom/bcm2835_thermal.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/thermal/broadcom/bcm2835_thermal.c b/drivers/thermal/broadcom/bcm2835_thermal.c
index a217d832f24e..ea07152a6d0d 100644
--- a/drivers/thermal/broadcom/bcm2835_thermal.c
+++ b/drivers/thermal/broadcom/bcm2835_thermal.c
@@ -269,13 +269,13 @@ static int bcm2835_thermal_probe(struct platform_device *pdev)
*/
err = thermal_add_hwmon_sysfs(tz);
if (err)
- goto err_tz;
+ goto err_clk;

bcm2835_thermal_debugfs(pdev);

return 0;
err_tz:
- thermal_of_zone_unregister(tz);
+ devm_thermal_of_zone_unregister(&pdev->dev, tz);
err_clk:
clk_disable_unprepare(data->clk);

@@ -285,10 +285,8 @@ static int bcm2835_thermal_probe(struct platform_device *pdev)
static int bcm2835_thermal_remove(struct platform_device *pdev)
{
struct bcm2835_thermal_data *data = platform_get_drvdata(pdev);
- struct thermal_zone_device *tz = data->tz;

debugfs_remove_recursive(data->debugfsdir);
- thermal_of_zone_unregister(tz);
clk_disable_unprepare(data->clk);

return 0;
--
2.34.1