platform/x86: int3472: Avoid crash in unregistering regulator gpio

When int3472 is loaded before GPIO driver, acpi_get_and_request_gpiod()
failed but the returned gpio descriptor is not NULL, it will cause panic
in later gpiod_put(), so set the gpio_desc to NULL in register error
handling to avoid such crash.

Signed-off-by: Hao Yao <hao.yao@intel.com>
Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
Link: https://lore.kernel.org/r/20230524035135.90315-1-bingbu.cao@intel.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/platform/x86/intel/int3472/clk_and_regulator.c b/drivers/platform/x86/intel/int3472/clk_and_regulator.c
index 1086c3d8349454f98ade335daf046bafc7d5116f..399f0623ca1b5ca817db2a30e5e4b425ef37cbed 100644 (file)
--- a/drivers/platform/x86/intel/int3472/clk_and_regulator.c
+++ b/drivers/platform/x86/intel/int3472/clk_and_regulator.c
@@ -101,9 +101,11 @@ int skl_int3472_register_clock(struct int3472_discrete_device *int3472,
 
        int3472->clock.ena_gpio = acpi_get_and_request_gpiod(path, agpio->pin_table[0],
                                                             "int3472,clk-enable");
-       if (IS_ERR(int3472->clock.ena_gpio))
-               return dev_err_probe(int3472->dev, PTR_ERR(int3472->clock.ena_gpio),
-                                    "getting clk-enable GPIO\n");
+       if (IS_ERR(int3472->clock.ena_gpio)) {
+               ret = PTR_ERR(int3472->clock.ena_gpio);
+               int3472->clock.ena_gpio = NULL;
+               return dev_err_probe(int3472->dev, ret, "getting clk-enable GPIO\n");
+       }
 
        if (polarity == GPIO_ACTIVE_LOW)
                gpiod_toggle_active_low(int3472->clock.ena_gpio);
@@ -199,8 +201,9 @@ int skl_int3472_register_regulator(struct int3472_discrete_device *int3472,
        int3472->regulator.gpio = acpi_get_and_request_gpiod(path, agpio->pin_table[0],
                                                             "int3472,regulator");
        if (IS_ERR(int3472->regulator.gpio)) {
-               dev_err(int3472->dev, "Failed to get regulator GPIO line\n");
-               return PTR_ERR(int3472->regulator.gpio);
+               ret = PTR_ERR(int3472->regulator.gpio);
+               int3472->regulator.gpio = NULL;
+               return dev_err_probe(int3472->dev, ret, "getting regulator GPIO\n");
        }
 
        /* Ensure the pin is in output mode and non-active state */