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xhci: dbgtty: fix device unregister

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When DbC is disconnected then xhci_dbc_tty_unregister_device()
is called. However if there is any user space process blocked
on write to DbC terminal device then it will never be signalled
and thus stay blocked indifinitely.

This fix adds a tty_vhangup() call in xhci_dbc_tty_unregister_device().
The tty_vhangup() wakes up any blocked writers and causes subsequent
write attempts to DbC terminal device to fail.

Cc: stable <stable@kernel.org>
Fixes: dfba2174dc ("usb: xhci: Add DbC support in xHCI driver")
Signed-off-by: Łukasz Bartosik <ukaszb@chromium.org>
Link: https://patch.msgid.link/20251119212910.1245694-1-ukaszb@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Łukasz Bartosik
2025-11-19 21:29:09 +00:00
committed by Greg Kroah-Hartman
parent b59d4fda7e
commit 1f73b8b56c
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/host/xhci-dbgtty.c
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@@ -550,6 +550,12 @@ static void xhci_dbc_tty_unregister_device(struct xhci_dbc *dbc)
if (!port->registered)
return;
/*
* Hang up the TTY. This wakes up any blocked
* writers and causes subsequent writes to fail.
*/
tty_vhangup(port->port.tty);
tty_unregister_device(dbc_tty_driver, port->minor);
xhci_dbc_tty_exit_port(port);
port->registered = false;