[PATCH 5.10 16/49] platform/x86: acer-wmi: Cleanup accelerometer device handling

gregkh
2021-03-10T13:26:18Z

From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit 9feb0763e4985ccfae632de3bb2f029cc8389842 ]

Cleanup accelerometer device handling:
-Drop acer_wmi_accel_destroy instead directly call input_unregister_device.
-The information tracked by the CAP_ACCEL flag mirrors acer_wmi_accel_dev
being NULL. Drop the CAP flag, this is a preparation change for allowing
users to override the capability flags. Dropping the flag stops users
from causing a NULL pointer dereference by forcing the capability.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20201019185628.264473-3-hdegoede@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/platform/x86/acer-wmi.c | 20 ++++++--------------
1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index 75b1f6ceb76e..184ec08d02a4 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -211,7 +211,6 @@ struct hotkey_function_type_aa {
#define ACER_CAP_BLUETOOTH BIT(2)
#define ACER_CAP_BRIGHTNESS BIT(3)
#define ACER_CAP_THREEG BIT(4)
-#define ACER_CAP_ACCEL BIT(5)

/*
* Interface type flags
@@ -1516,7 +1515,7 @@ static int acer_gsensor_event(void)
struct acpi_buffer output;
union acpi_object out_obj[5];

- if (!has_cap(ACER_CAP_ACCEL))
+ if (!acer_wmi_accel_dev)
return -1;

output.length = sizeof(out_obj);
@@ -1890,8 +1889,6 @@ static int __init acer_wmi_accel_setup(void)
gsensor_handle = acpi_device_handle(adev);
acpi_dev_put(adev);

- interface->capability |= ACER_CAP_ACCEL;
-
acer_wmi_accel_dev = input_allocate_device();
if (!acer_wmi_accel_dev)
return -ENOMEM;
@@ -1917,11 +1914,6 @@ err_free_dev:
return err;
}

-static void acer_wmi_accel_destroy(void)
-{
- input_unregister_device(acer_wmi_accel_dev);
-}
-
static int __init acer_wmi_input_setup(void)
{
acpi_status status;
@@ -2076,7 +2068,7 @@ static int acer_resume(struct device *dev)
if (has_cap(ACER_CAP_BRIGHTNESS))
set_u32(data->brightness, ACER_CAP_BRIGHTNESS);

- if (has_cap(ACER_CAP_ACCEL))
+ if (acer_wmi_accel_dev)
acer_gsensor_init();

return 0;
@@ -2266,8 +2258,8 @@ error_device_alloc:
error_platform_register:
if (wmi_has_guid(ACERWMID_EVENT_GUID))
acer_wmi_input_destroy();
- if (has_cap(ACER_CAP_ACCEL))
- acer_wmi_accel_destroy();
+ if (acer_wmi_accel_dev)
+ input_unregister_device(acer_wmi_accel_dev);

return err;
}
@@ -2277,8 +2269,8 @@ static void __exit acer_wmi_exit(void)
if (wmi_has_guid(ACERWMID_EVENT_GUID))
acer_wmi_input_destroy();

- if (has_cap(ACER_CAP_ACCEL))
- acer_wmi_accel_destroy();
+ if (acer_wmi_accel_dev)
+ input_unregister_device(acer_wmi_accel_dev);

remove_debugfs();
platform_device_unregister(acer_platform_device);
--
2.30.1