From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 89E0F335BDC for ; Mon, 1 Dec 2025 17:12:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764609133; cv=none; b=MzY37OO44bvYUV+r3G+vXR/ZcsEBEMvMnRQV82tokZ4y07UdOvYcaPuiRU0/5ozuSe3EYM8VGdhPha6w8Lmf9AwampyPdwiFxOVKUpyuYlMnL9JjVl9ATsmbeNDzjRosooxqP84Qp+znSVY6wulwFWvM/3Hk/i4WwBtLkU+lsGQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764609133; c=relaxed/simple; bh=TlAN2cItmErfGghtc2FK9E7jtd1uSoQF0QzkME/R2z0=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=kULD9akhi02TcHW7vUOgq1XzwBoWvkZV3w4EwTo81khI7GMtdT9CpgHMLICO+5rwjl+saztgQqqAPuIIB5qbm18RbRcCmXgedrFvzayy5k8pyYQZN63EK3N0O+JghPHI5jqCXwILH6PKKX84AqgmXCH+7PdBCkQ7SKKE/JnR5ss= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ZoDBUTul; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ZoDBUTul" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E1CACC19422; Mon, 1 Dec 2025 17:12:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1764609133; bh=TlAN2cItmErfGghtc2FK9E7jtd1uSoQF0QzkME/R2z0=; h=Subject:To:Cc:From:Date:From; b=ZoDBUTul9g7YeqUMJB/Janpq9rUZSy3Rgks9lfAt8G6mJcG4I1MUMuWnnFdaNH9+X bkQC//4xdSHyBsvwbYNNpGXkhRd/qTeSRo7I3jE0T9SDitA8j5x0Titn7szibJZrON 5+BuM5CW6RzveT9BkIXsNANbjauMsg89xeWBXms4= Subject: FAILED: patch "[PATCH] xhci: dbgtty: fix device unregister" failed to apply to 5.15-stable tree To: ukaszb@chromium.org,gregkh@linuxfoundation.org,stable@kernel.org Cc: From: Date: Mon, 01 Dec 2025 18:12:10 +0100 Message-ID: <2025120110-deuce-arrange-e66c@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-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 . 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-5.15.y git checkout FETCH_HEAD git cherry-pick -x 1f73b8b56cf35de29a433aee7bfff26cea98be3f # git commit -s git send-email --to '' --in-reply-to '2025120110-deuce-arrange-e66c@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 1f73b8b56cf35de29a433aee7bfff26cea98be3f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C5=81ukasz=20Bartosik?= Date: Wed, 19 Nov 2025 21:29:09 +0000 Subject: [PATCH] xhci: dbgtty: fix device unregister MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Fixes: dfba2174dc42 ("usb: xhci: Add DbC support in xHCI driver") Signed-off-by: Łukasz Bartosik Link: https://patch.msgid.link/20251119212910.1245694-1-ukaszb@google.com Signed-off-by: Greg Kroah-Hartman diff --git a/drivers/usb/host/xhci-dbgtty.c b/drivers/usb/host/xhci-dbgtty.c index b7f95565524d..57cdda4e09c8 100644 --- a/drivers/usb/host/xhci-dbgtty.c +++ b/drivers/usb/host/xhci-dbgtty.c @@ -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;