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 36E3212C480 for ; Tue, 23 Apr 2024 12:55:06 +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=1713876907; cv=none; b=JfgNu6UjKFv4sPXhzD+IRGaOfvGVupThQc1PXwx5myqXz7fOHVMlvxCVeFpI9A2hFjnQaeUPoXLkUzcamWYfPSsdGuQoru5+iWr4u9awk9mTc6yBT6FqzHuY7yMBfIaZaasfMCgoSsaQSsTxx4tKzQWFVDPdmjxXCStT3LV3YhQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713876907; c=relaxed/simple; bh=qYL9rtL+6Y0XBS2XcW7eWGHM+ok9LwLJMywEpTOtjTw=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=sIGg7YtAuCqlEcJGysJbOjRyigT4mewVlUaPnLc/9VK7eWe506wE77Yow3OKfYDnyFDXGeNPuI/zFnACw/JpIaU7zDGHfcwNI71M2GB9VXxJBzdtxZ9mE25Zemgwb+lKyb2rFvs6d6mx3bwOekaGdh/9OndoS3Ns/4bmjmQ1jpQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zxLdL9zx; 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="zxLdL9zx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B699DC3277B; Tue, 23 Apr 2024 12:55:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1713876906; bh=qYL9rtL+6Y0XBS2XcW7eWGHM+ok9LwLJMywEpTOtjTw=; h=Subject:To:Cc:From:Date:From; b=zxLdL9zxtZaRY/NNsG3BkfHp2j25fY+38G8bR4WOyX8i7iOgpxx1VUANA2KjY5fGc STHgXCWP73Z/z9r5ZeKHiIPbclOPrfsHah1kTtvcJrCjfmOP2aVqpFbDHF047et22L pt38xsjilPSn1Hvy1vNV6+ZmVs4C6rllKMC3QXqA= Subject: FAILED: patch "[PATCH] serial: mxs-auart: add spinlock around changing cts state" failed to apply to 4.19-stable tree To: emil.kronborg@protonmail.com,Frank.Li@nxp.com,gregkh@linuxfoundation.org Cc: From: Date: Tue, 23 Apr 2024 05:54:57 -0700 Message-ID: <2024042357-dropbox-unhitched-ffb8@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 4.19-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-4.19.y git checkout FETCH_HEAD git cherry-pick -x 54c4ec5f8c471b7c1137a1f769648549c423c026 # git commit -s git send-email --to '' --in-reply-to '2024042357-dropbox-unhitched-ffb8@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^.. Possible dependencies: 54c4ec5f8c47 ("serial: mxs-auart: add spinlock around changing cts state") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 54c4ec5f8c471b7c1137a1f769648549c423c026 Mon Sep 17 00:00:00 2001 From: Emil Kronborg Date: Wed, 20 Mar 2024 12:15:36 +0000 Subject: [PATCH] serial: mxs-auart: add spinlock around changing cts state The uart_handle_cts_change() function in serial_core expects the caller to hold uport->lock. For example, I have seen the below kernel splat, when the Bluetooth driver is loaded on an i.MX28 board. [ 85.119255] ------------[ cut here ]------------ [ 85.124413] WARNING: CPU: 0 PID: 27 at /drivers/tty/serial/serial_core.c:3453 uart_handle_cts_change+0xb4/0xec [ 85.134694] Modules linked in: hci_uart bluetooth ecdh_generic ecc wlcore_sdio configfs [ 85.143314] CPU: 0 PID: 27 Comm: kworker/u3:0 Not tainted 6.6.3-00021-gd62a2f068f92 #1 [ 85.151396] Hardware name: Freescale MXS (Device Tree) [ 85.156679] Workqueue: hci0 hci_power_on [bluetooth] (...) [ 85.191765] uart_handle_cts_change from mxs_auart_irq_handle+0x380/0x3f4 [ 85.198787] mxs_auart_irq_handle from __handle_irq_event_percpu+0x88/0x210 (...) Cc: stable@vger.kernel.org Fixes: 4d90bb147ef6 ("serial: core: Document and assert lock requirements for irq helpers") Reviewed-by: Frank Li Signed-off-by: Emil Kronborg Link: https://lore.kernel.org/r/20240320121530.11348-1-emil.kronborg@protonmail.com Signed-off-by: Greg Kroah-Hartman diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c index 4749331fe618..1e8853eae504 100644 --- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -1086,11 +1086,13 @@ static void mxs_auart_set_ldisc(struct uart_port *port, static irqreturn_t mxs_auart_irq_handle(int irq, void *context) { - u32 istat; + u32 istat, stat; struct mxs_auart_port *s = context; u32 mctrl_temp = s->mctrl_prev; - u32 stat = mxs_read(s, REG_STAT); + uart_port_lock(&s->port); + + stat = mxs_read(s, REG_STAT); istat = mxs_read(s, REG_INTR); /* ack irq */ @@ -1126,6 +1128,8 @@ static irqreturn_t mxs_auart_irq_handle(int irq, void *context) istat &= ~AUART_INTR_TXIS; } + uart_port_unlock(&s->port); + return IRQ_HANDLED; }