From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 35C3F3F6606 for ; Mon, 5 Oct 2026 10:19:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791195547; cv=none; b=H3ap88LU81s+7h9iZ9hn8f4haEcw23Qy/N+RCVun4+IHYT25OwuBJixhdQjY7ESsXjUw0ptSNBZTwYGppEo3FCHqrb2oglDWOK+6DKhrbj5jg2zbwmO8iSyGbZkDMIjIiUEpJwPN0qW99SkkktSG8KufNXElBmhtdkjNmh7wd5Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791195547; c=relaxed/simple; bh=EZHQogngTK4J4kFiCE13dQZ11mbGTsfc4hkWjQBZxD4=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=dm9nTlKwjmqU9tlTCSm3mWezgiAvxVlkMM1wKxbTSd6FLJL6nTgLXI2RyvlfT1vnH5ZEKGJSWGJMJRZ/Rt/VJJZqL9uuEKukIWUHxevfrTna11lGCc3u62ENaIR04G/bcnp97KGQNpgNGtid6YfbBw0kzy5kKgaohAghSIUj0EU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Ek1Os5ba; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Ek1Os5ba" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A5131F000FF; Mon, 5 Oct 2026 10:19:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1791195545; bh=F9QOPh8yS93eXoBvqmcMgOjZ2NBCQKWht/bJ0L5ifQU=; h=Subject:To:Cc:From:Date; b=Ek1Os5bacPUfM3mYgmwxTm4LBKL4r0ES+/Dnh0dHSYz4brFCQUDRJCFM3ba1NLeBn XhvF7LWTHDAiemVPkCL/OICKCyvcRWz9MgGXi9T/E54MDPjJv6CjkFDSLJ7DGPGZZU fYl292g7Flzkv/xKve40o6xMzr1zGmPsYeZ0XOlA= Subject: FAILED: patch "[PATCH] serial: fix TIOCMIWAIT race" failed to apply to 6.6-stable tree To: johan@kernel.org,gregkh@linuxfoundation.org Cc: From: Date: Mon, 05 Oct 2026 12:19:02 +0200 Message-ID: <2026100501-rubber-equipment-9072@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=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.6-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-6.6.y git checkout FETCH_HEAD git cherry-pick -x 40adffec8c0090533dfaa863ced7901b60bbf1dc # git commit -s git send-email --to '' --in-reply-to '2026100501-rubber-equipment-9072@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 40adffec8c0090533dfaa863ced7901b60bbf1dc Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Thu, 10 Sep 2026 15:08:15 +0200 Subject: [PATCH] serial: fix TIOCMIWAIT race The task state must be updated before checking the wakeup condition to avoid missing a racing modem status update. 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 Link: https://patch.msgid.link/20260910130816.642699-4-johan@kernel.org Signed-off-by: Greg Kroah-Hartman diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 139b93876229..f7b30f77b231 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1230,12 +1230,12 @@ static int uart_wait_modem_status(struct tty_struct *tty, struct uart_state *sta add_wait_queue(&port->delta_msr_wait, &wait); for (;;) { + set_current_state(TASK_INTERRUPTIBLE); + uart_port_lock_irq(uport); memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); uart_port_unlock_irq(uport); - set_current_state(TASK_INTERRUPTIBLE); - if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||