[PATCH 6.12 493/567] xhci: dbgtty: fix device unregister: fixup

Greg Kroah-Hartman
2026-01-06T17:43:04Z

From: Łukasz Bartosik <ukaszb@chromium.org>

[ Upstream commit 74098cc06e753d3ffd8398b040a3a1dfb65260c0 ]

This fixup replaces tty_vhangup() call with call to
tty_port_tty_vhangup(). Both calls hangup tty device
synchronously however tty_port_tty_vhangup() increases
reference count during the hangup operation using
scoped_guard(tty_port_tty).

Cc: stable <stable@kernel.org>
Fixes: 1f73b8b56cf3 ("xhci: dbgtty: fix device unregister")
Signed-off-by: Łukasz Bartosik <ukaszb@chromium.org>
Link: https://patch.msgid.link/20251127111644.3161386-1-ukaszb@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/host/xhci-dbgtty.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/host/xhci-dbgtty.c
+++ b/drivers/usb/host/xhci-dbgtty.c
@@ -522,7 +522,7 @@ static void xhci_dbc_tty_unregister_devi
* Hang up the TTY. This wakes up any blocked
* writers and causes subsequent writes to fail.
*/
- tty_vhangup(port->port.tty);
+ tty_port_tty_vhangup(&port->port);

tty_unregister_device(dbc_tty_driver, port->minor);
xhci_dbc_tty_exit_port(port);