From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A48B0C7EE2C for ; Mon, 5 Jun 2023 03:04:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231671AbjFEDEp (ORCPT ); Sun, 4 Jun 2023 23:04:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59800 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230153AbjFEDEl (ORCPT ); Sun, 4 Jun 2023 23:04:41 -0400 Received: from mail-ua1-x92d.google.com (mail-ua1-x92d.google.com [IPv6:2607:f8b0:4864:20::92d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CEFC8A9 for ; Sun, 4 Jun 2023 20:04:40 -0700 (PDT) Received: by mail-ua1-x92d.google.com with SMTP id a1e0cc1a2514c-786e783a748so1185029241.2 for ; Sun, 04 Jun 2023 20:04:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1685934280; x=1688526280; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=8GemXbMIq5lp+454RKyClJK8enwTWlxZVZu2OjpvqlY=; b=oPX1da39xxxDeDArWOnV6VvW0eqMDZSK7f9Ve9mZ0kzDSYY1VOdxziYIN0/fC6NW1m F/prs75MzDyyEYf0I12KVAvkEYP3P2XZcNI5tU3X7t4GTFd4snKp7LpRiaKWrmR/jKQ+ +HFYU/lo//sCc8NY3bh61JGMniX1nPvtycInI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685934280; x=1688526280; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=8GemXbMIq5lp+454RKyClJK8enwTWlxZVZu2OjpvqlY=; b=fZVVVabUmMy/a4D0guZiyBrqZ/dLJxHYSrIDrNaPAqkCWTH9EkI8rK6dDyF/jVaQHa zFZvQhkzjEMEVA0YSppTbxtfAJ7netM6ltX6WTSmc0vCGlHB/98vvDq+/szzSCm8e3Zr A9BQLHM5ow75MA3V3dEXTI558BhNBtr68BQiW/FWEWp6rUAkV9VJDbkulJ+f8mXNSrZV 8hgi+IRt3nOV4w2nxurfOAhZU4isaISVGJYHVKovLECDTv61pmqmEa/EZ7thslZRBkL3 4CSOKvUe5Z4Bdu0CovK0NBhWLShn0e+6Euta6ZCoQWWwnr86yRWy52410AIQNQtD7mZC XCCg== X-Gm-Message-State: AC+VfDwxYk0SfY8E20UmXIt/Xl5eV7wHAsFDQ3j/tnB1q244m17MGlH9 r6eKrswlbHFvpKao1vrIaqQKxetYC8CH0amE1kscZA== X-Google-Smtp-Source: ACHHUZ6jpGq4+6/+6ClKSVvkgkwQzzirwShAHbQSCjNu7NjQjavUuh0PcSmBXhB3NwTi/oX4WQQPRVTj7U6bPKM8aSE= X-Received: by 2002:a1f:3d4e:0:b0:45c:e022:d713 with SMTP id k75-20020a1f3d4e000000b0045ce022d713mr4342803vka.12.1685934279946; Sun, 04 Jun 2023 20:04:39 -0700 (PDT) MIME-Version: 1.0 References: <20230525113034.46880-1-tony@atomide.com> <20230602083335.GA181647@google.com> <87a5xii33r.fsf@jogness.linutronix.de> In-Reply-To: <87a5xii33r.fsf@jogness.linutronix.de> From: Chen-Yu Tsai Date: Mon, 5 Jun 2023 11:04:28 +0800 Message-ID: Subject: Re: [PATCH v12 1/1] serial: core: Start managing serial controllers to enable runtime PM To: John Ogness Cc: Tony Lindgren , Greg Kroah-Hartman , Jiri Slaby , Andy Shevchenko , Dhruva Gole , =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= , Johan Hovold , Sebastian Andrzej Siewior , Vignesh Raghavendra , linux-omap@vger.kernel.org, Andy Shevchenko , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, =?UTF-8?B?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= , AngeloGioacchino Del Regno , linux-mediatek@lists.infradead.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 2, 2023 at 6:13=E2=80=AFPM John Ogness wrote: > > On 2023-06-02, Chen-Yu Tsai wrote: > > This patch, in linux-next since 20230601, unfortunately breaks > > MediaTek based Chromebooks. The kernel hangs during the probe of the > > serial ports, which use the 8250_mtk driver. > > Are you sure it is this patch? Have you bisected it? > > Unfortunately next-20230601 also brought in a series that added > spinlocking to the 8250 driver. That may be the issue here instead. > > For 8250 bug reports we really need to bisection. As Tony mentioned, you're off the hook for it. I should've been more clear. After reverting the top three patches in drivers/tty/serial from next-20230602, the system booted correctly again: 539914240a01 serial: core: Fix probing serial_base_bus devices d0a396083e91 serial: core: Don't drop port_mutex in serial_core_remove_one_port 84a9582fd203 serial: core: Start managing serial controllers to enable runtime PM ChenYu