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serial: abort TIOCMIWAIT on hangup

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Add the missing hangup check to the TIOCMIWAIT wait loop to avoid going
back to sleep (indefinitely) after being woken on hangup.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: sashiko-bot@kernel.org
Link: https://lore.kernel.org/r/20260904115542.E20D11F00A3D@smtp.kernel.org
Cc: stable@kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20260910130816.642699-5-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2026-09-10 15:08:16 +02:00 committed by Greg Kroah-Hartman
parent 40adffec8c
commit eb35b73e13
1 changed files with 5 additions and 0 deletions
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5
drivers/tty/serial/serial_core.c
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@ -1244,6 +1244,11 @@ static int uart_wait_modem_status(struct tty_struct *tty, struct uart_state *sta
break;
}
if (tty_io_error(tty)) {
ret = -EIO;
break;
}
schedule();
/* see if a signal did it */