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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>
hifive-unleashed-5.1
Benjamin Tissoires 2017-01-20 16:20:11 +01:00 committed by Jiri Kosina
parent 2ed5e5af2f
commit 5b779fc520
1 changed files with 2 additions and 0 deletions
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2
drivers/hid/wacom_sys.c
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@ -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);
}