FAILED: patch "[PATCH] serial: abort TIOCMIWAIT on hangup" failed to apply to 6.18-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.18-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.18.y
git checkout FETCH_HEAD
git cherry-pick -x eb35b73e133686e5b999eb7130c4e3d22fe03089
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026100556-jimmy-pending-cc18@gregkh' --subject-prefix 'PATCH 6.18.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From eb35b73e133686e5b999eb7130c4e3d22fe03089 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Thu, 10 Sep 2026 15:08:16 +0200
Subject: [PATCH] serial: abort TIOCMIWAIT on hangup

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

Fixes: 1da177e4c3f4 ("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>

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index f7b30f77b231..33c8f3b6ac81 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -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 */