[PATCH 6.4 439/800] platform/x86: lenovo-yogabook: Fix work race on remove()

Greg Kroah-Hartman
2023-07-16T20:13:23Z

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

[ Upstream commit 9148cd2eb4450a8e9c49c8a14201fb82f651128f ]

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: c0549b72d99d ("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>
---
drivers/platform/x86/lenovo-yogabook-wmi.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/platform/x86/lenovo-yogabook-wmi.c b/drivers/platform/x86/lenovo-yogabook-wmi.c
index 5f4bd1eec38a9..3a6de4ab74a41 100644
--- a/drivers/platform/x86/lenovo-yogabook-wmi.c
+++ b/drivers/platform/x86/lenovo-yogabook-wmi.c
@@ -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);
--
2.39.2