[PATCH 4.14 42/59] net: cdc-phonet: fix data-interface release on probe failure

[Greg Kroah-Hartman]

From: Johan Hovold <jo...@kernel.org>

[ Upstream commit c79a707072fe3fea0e3c92edee6ca85c1e53c29f ]

Set the disconnected flag before releasing the data interface in case
netdev registration fails to avoid having the disconnect callback try to
deregister the never registered netdev (and trigger a WARN_ON()).

Fixes: 87cf65601e17 ("USB host CDC Phonet network interface driver")
Signed-off-by: Johan Hovold <jo...@kernel.org>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/net/usb/cdc-phonet.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/usb/cdc-phonet.c b/drivers/net/usb/cdc-phonet.c
index 288ecd999171..7a18eb0784f3 100644
--- a/drivers/net/usb/cdc-phonet.c
+++ b/drivers/net/usb/cdc-phonet.c
@@ -398,6 +398,8 @@ static int usbpn_probe(struct usb_interface *intf, const 
struct usb_device_id *i
 
        err = register_netdev(dev);
        if (err) {
+               /* Set disconnected flag so that disconnect() returns early. */
+               pnd->disconnected = 1;
                usb_driver_release_interface(&usbpn_driver, data_intf);
                goto out;
        }
-- 
2.30.1