HID: wacom: release the resources before leaving despite devm

In the general case, the resources are properly released by devm without
needing to do anything. However, when unplugging the wireless receiver,
the kernel segfaults from time to time while calling devres_release_all().

I think in that case the resources attempt to access hid_get_drvdata(hdev)
which has been set to null while leaving wacom_remove().

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 8aeca038cc7331244eeeb5dc0468b22ef66e7d44..0a817e69e029f42abfe2d685274f7e3984be6215 100644 (file)
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -2497,6 +2497,8 @@ static void wacom_remove(struct hid_device *hdev)
        if (hdev->bus == BUS_BLUETOOTH)
                device_remove_file(&hdev->dev, &dev_attr_speed);
 
+       wacom_release_resources(wacom);
+
        hid_set_drvdata(hdev, NULL);
 }