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platform/x86: lenovo-yogabook: Fix work race on remove()

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[ Upstream commit 9148cd2eb4 ]

When yogabook_wmi_remove() runs yogabook_wmi_work might still be running
and using the devices which yogabook_wmi_remove() puts.

To avoid this move to explicitly cancelling the work rather then using
devm_work_autocancel().

This requires also making the yogabook_backside_hall_irq handler non
devm managed, so that it cannot re-queue the work while
yogabook_wmi_remove() runs.

Fixes: c0549b72d9 ("platform/x86: lenovo-yogabook-wmi: Add driver for Lenovo Yoga Book")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230430165807.472798-3-hdegoede@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hans de Goede 2023-04-30 18:57:50 +02:00 committed by Greg Kroah-Hartman
parent 641516c20b
commit 7db86294ec
1 changed files with 10 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
drivers/platform/x86/lenovo-yogabook-wmi.c
View file

@ -2,7 +2,6 @@
/* WMI driver for Lenovo Yoga Book YB1-X90* / -X91* tablets */
#include <linux/acpi.h>
#include <linux/devm-helpers.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
#include <linux/interrupt.h>
@ -248,10 +247,7 @@ static int yogabook_wmi_probe(struct wmi_device *wdev, const void *context)
data->brightness = YB_KBD_BL_DEFAULT;
set_bit(YB_KBD_IS_ON, &data->flags);
set_bit(YB_DIGITIZER_IS_ON, &data->flags);
r = devm_work_autocancel(&wdev->dev, &data->work, yogabook_wmi_work);
if (r)
return r;
INIT_WORK(&data->work, yogabook_wmi_work);
data->kbd_adev = acpi_dev_get_first_match_dev("GDIX1001", NULL, -1);
if (!data->kbd_adev) {
@ -299,10 +295,9 @@ static int yogabook_wmi_probe(struct wmi_device *wdev, const void *context)
}
data->backside_hall_irq = r;
r = devm_request_irq(&wdev->dev, data->backside_hall_irq,
yogabook_backside_hall_irq,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"backside_hall_sw", data);
r = request_irq(data->backside_hall_irq, yogabook_backside_hall_irq,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"backside_hall_sw", data);
if (r) {
dev_err_probe(&wdev->dev, r, "Requesting backside_hall_sw IRQ\n");
goto error_put_devs;
@ -318,11 +313,14 @@ static int yogabook_wmi_probe(struct wmi_device *wdev, const void *context)
r = devm_led_classdev_register(&wdev->dev, &data->kbd_bl_led);
if (r < 0) {
dev_err_probe(&wdev->dev, r, "Registering backlight LED device\n");
goto error_put_devs;
goto error_free_irq;
}
return 0;
error_free_irq:
free_irq(data->backside_hall_irq, data);
cancel_work_sync(&data->work);
error_put_devs:
put_device(data->dig_dev);
put_device(data->kbd_dev);
@ -335,6 +333,8 @@ static void yogabook_wmi_remove(struct wmi_device *wdev)
{
struct yogabook_wmi *data = dev_get_drvdata(&wdev->dev);
free_irq(data->backside_hall_irq, data);
cancel_work_sync(&data->work);
put_device(data->dig_dev);
put_device(data->kbd_dev);
acpi_dev_put(data->dig_adev);