[PATCH] iio: light: gp2ap020a00f: drain irq_work after free_irq

The threaded IRQ handler queues data->work through irq_work_queue() so
the trigger is polled from a per-CPU context.  free_irq() does not flush
an irq_work the handler already queued, so after gp2ap020a00f_remove()
returns that work may still run and call iio_trigger_poll() on data->trig,
which the devm cleanup has already freed, causing a use-after-free.

Add irq_work_sync(&data->work) after free_irq() in remove() and in the
probe error path, mirroring commit 78601726d4a5 ("iio: trigger: sysfs:
fix use-after-free on remove").

Found by an in-house static analysis tool, confirmed by manual review.

Fixes: bf29fbeaa13d ("iio: gp2ap020a00f: Add a driver for the device")
Cc: [email protected]
Assisted-by: Codex:gpt-5.6
Signed-off-by: Fan Wu <[email protected]>
---
 drivers/iio/light/gp2ap020a00f.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/light/gp2ap020a00f.c b/drivers/iio/light/gp2ap020a00f.c
index c7df4b258e2c..20d1aa9e99d7 100644
--- a/drivers/iio/light/gp2ap020a00f.c
+++ b/drivers/iio/light/gp2ap020a00f.c
@@ -1560,6 +1560,7 @@ static int gp2ap020a00f_probe(struct i2c_client *client)
 	iio_trigger_unregister(data->trig);
 error_free_irq:
 	free_irq(client->irq, indio_dev);
+	irq_work_sync(&data->work);
 error_uninit_buffer:
 	iio_triggered_buffer_cleanup(indio_dev);
 error_regulator_disable:
@@ -1582,6 +1583,7 @@ static void gp2ap020a00f_remove(struct i2c_client *client)
 	iio_device_unregister(indio_dev);
 	iio_trigger_unregister(data->trig);
 	free_irq(client->irq, indio_dev);
+	irq_work_sync(&data->work);
 	iio_triggered_buffer_cleanup(indio_dev);
 	regulator_disable(data->vled_reg);
 }