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 A5073336EC8 for ; Mon, 1 Dec 2025 17:12:21 +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=1764609141; cv=none; b=qWtpQzRqUHq7FvLnsBsaiLrVci8dL4Fc+WZfDZseb8XAf1v6+eXTZP3sX5AiFONuqSbpaZXc0Izf+LDwUWM9e92CfsXyMTXgIuQTz1rykGAoIllLnHqhQQTU8jEhtk4zmM3NDhycAXMl4qma9JbbRxNPJdgi18PPee+EshIXHn0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764609141; c=relaxed/simple; bh=808iOgUlLiqYTFfK0U373Sta2EyyPA29sNC5SFEkts4=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=LN5dBDmuXFvBanW8e1xbndmflgU5+XeCWl6gQVT3IaEs8mVktxbRKUEkLAQceZvFgcWa2jQfPkrUnWIhP3nxToMuDwBtE4+LL/K+B14qrngXSZJ4KDshSfk7snXmNzZHExPx6Fxv8YLD5xBnh+4t7++pwFHcO2wb4uSu2zwV64c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=vBlBWXVn; 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="vBlBWXVn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 20A06C19422; Mon, 1 Dec 2025 17:12:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1764609141; bh=808iOgUlLiqYTFfK0U373Sta2EyyPA29sNC5SFEkts4=; h=Subject:To:Cc:From:Date:From; b=vBlBWXVnxEsHBALWKU9oWGyENtFzui9VmrbzSE1WSyhfAW7Gn4cPzHv3N/oxA1cAd zc+PU8P1fTq7aP9gOtEenjWnLG9NqJc9b+/D+YkjYYmTnIjeNFhZ6KDSXU9xhKzqE+ b8nNw3/QYr+E67ZEEZZNof0Gp1Sf/+IakKwuf4SY= Subject: FAILED: patch "[PATCH] xhci: dbgtty: fix device unregister" failed to apply to 5.10-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-coastal-litigator-8952@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 5.10-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-5.10.y git checkout FETCH_HEAD git cherry-pick -x 1f73b8b56cf35de29a433aee7bfff26cea98be3f # git commit -s git send-email --to '' --in-reply-to '2025120110-coastal-litigator-8952@gregkh' --subject-prefix 'PATCH 5.10.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;