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HID: elo: update the reference count of the usb device structure
Use usb_get_dev() to increment the reference count of the usb device structure in order to avoid releasing the structure while it is still in use. And use usb_put_dev() to decrement the reference count and thus, when it will be equal to 0 the structure will be released. Signed-off-by: Salah Triki <salah.triki@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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@ -228,13 +228,15 @@ static int elo_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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struct elo_priv *priv;
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int ret;
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struct usb_device *udev;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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INIT_DELAYED_WORK(&priv->work, elo_work);
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priv->usbdev = interface_to_usbdev(to_usb_interface(hdev->dev.parent));
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udev = interface_to_usbdev(to_usb_interface(hdev->dev.parent));
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priv->usbdev = usb_get_dev(udev);
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hid_set_drvdata(hdev, priv);
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@ -265,6 +267,8 @@ static void elo_remove(struct hid_device *hdev)
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{
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struct elo_priv *priv = hid_get_drvdata(hdev);
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usb_put_dev(priv->usbdev);
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hid_hw_stop(hdev);
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cancel_delayed_work_sync(&priv->work);
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kfree(priv);
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