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 X-Spam-Level: X-Spam-Status: No, score=-3.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98CB8C07E99 for ; Fri, 9 Jul 2021 14:40:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8139D613BE for ; Fri, 9 Jul 2021 14:40:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232053AbhGIOnd (ORCPT ); Fri, 9 Jul 2021 10:43:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34790 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229561AbhGIOnb (ORCPT ); Fri, 9 Jul 2021 10:43:31 -0400 Received: from mail-pg1-x52a.google.com (mail-pg1-x52a.google.com [IPv6:2607:f8b0:4864:20::52a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 58E1DC0613DD for ; Fri, 9 Jul 2021 07:40:47 -0700 (PDT) Received: by mail-pg1-x52a.google.com with SMTP id v7so10178485pgl.2 for ; Fri, 09 Jul 2021 07:40:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to:cc; bh=iNaMv+HNHxIxr6Dyhl2gmTLQROfPovPZ0MJThVct2O0=; b=qmLi9zCwaPUjbBbGnhZgKmeBJTxLBLZ6BTSEi8+a4ljUcrq0i8meVkJgQta7oC7YwT +JVIzYPwtvQS3ov6vJuYUeeAp59mCrSyjcxsE+hUGMoMf0LqQY3QK5988AYPZqr0LGcP nYgrllSMDxV0sOZV4+cZXkqcSTOlDLoDMZL6cG2Hhzg+IQFlCw4KaTD4Y79hc8dsq/yZ 3WM8m218m/tj7pAKMTz3z+qfmsaPAWxF8kawj2V390+Y5kHvQiytMyEKKYKRNhg0bTIt zfVaTqpH8INk+ywpnzznBTg4l0f1Nwzhw5GBtxKumm8h98dU0oGWvNZkqq5Q6Jd5n6c9 ES3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=iNaMv+HNHxIxr6Dyhl2gmTLQROfPovPZ0MJThVct2O0=; b=G1KpXCxrxL/1TRWDxTjXmCcNBjweGLUSnH4Qr0IDYygNjttZMa36oU9DhRhyJVGqfc z4r3+eq4AJTSzQgsKDtDEF1Ffox153sYgTyX2N7y08vN639Zs38iCKhhPPZWY3WR04Uy je7gt5iXTwKSuxN/ORUUAgnKtpR6ae/+IXMo/kRSgFkKpcd/ttIKP0uRcz7bnPWwEEiK +FZnZul9a8tMAMLi5IsBfskBB5fyDNAv9uXpscBTH1yeSiO8qZ3M4CY/cE/CZi+4+I8E KppjnBwYLMXggJhh+KuISANuGGZSvOo7E29SnLM+T7EpDeHGWNuj3jjAPTBCu9rzGK9O pOfw== X-Gm-Message-State: AOAM532YXp8LfyE0HmoeX9GsFlIZrwlCjh6UaD18GdBPnVIEGOvrLQEk VCglLDvALMkdh6ntd6qEVD0yeIJMH/GqqTtLol5+gh1d5vzRJw== X-Google-Smtp-Source: ABdhPJygDpsoyQwVjnWLuYpsPKjX1pqTQZ+XWaZqC7x+egvVQ4Bhrz9QhuMde3MHw4g04dpnvnqqPXYb9JYJSK/BNUg= X-Received: by 2002:a63:f609:: with SMTP id m9mr38810445pgh.74.1625841646733; Fri, 09 Jul 2021 07:40:46 -0700 (PDT) MIME-Version: 1.0 From: Andy Shevchenko Date: Fri, 9 Jul 2021 17:40:08 +0300 Message-ID: Subject: parallel panel display stopped working To: Linux Kernel Mailing List , Miguel Ojeda , Lars Poeschel Cc: Andy Shevchenko , Geert Uytterhoeven Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Parallel (4 bits) panel display stopped working. I have no time right now to bisect but I have noticed there was quite a pile of patches from Lars to the driver recently (yeah, it seems for a few months I haven't run my tests against the AUX display driver). I believe the issue is there somewhere. Moreover on the removal I have got an oops [ 218.825445] kernel tried to execute NX-protected page - exploit attempt? (uid: 0) [ 218.832965] BUG: unable to handle page fault for address: ffff8f8f06559dc0 [ 218.839863] #PF: supervisor instruction fetch in kernel mode [ 218.845540] #PF: error_code(0x0011) - permissions violation [ 218.851132] PGD e601067 P4D e601067 PUD e602067 PMD 645a063 PTE 8000000006559063 [ 218.858587] Oops: 0011 [#1] SMP PTI [ 218.862099] CPU: 0 PID: 7 Comm: kworker/u4:0 Tainted: G C 5.13.0+ #23 [ 218.869870] Hardware name: Intel Corporation Merrifield/BODEGA BAY, BIOS 542 2015.01.21:18.19.48 [ 218.878681] Workqueue: kacpi_hotplug acpi_device_del_work_fn [ 218.884380] RIP: 0010:0xffff8f8f06559dc0 [ 218.888328] Code: ff ff d2 2b 21 8c ff ff ff ff 08 00 00 00 00 00 00 00 78 34 fa 02 8f 8f ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <72> 65 67 75 6c 61 74 6f 72 3a 72 65 67 75 6c 61 74 6f 72 2e 30 2d [ 218.907138] RSP: 0000:ffffad36c0043c90 EFLAGS: 00010246 [ 218.912387] RAX: ffff8f8f06559dc0 RBX: ffff8f8f062cbc00 RCX: ffff8f8f01239fc8 [ 218.919542] RDX: 000000002a3cccf8 RSI: 0000000000000001 RDI: ffff8f8f06559480 [ 218.926701] RBP: ffffffffc037e279 R08: 00000000d5832520 R09: 0000000000000001 [ 218.933856] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8f8f062cbc00 [ 218.941010] R13: ffffffffc038e028 R14: ffffffff8c5e0b60 R15: 00000000fffffffd [ 218.948166] FS: 0000000000000000(0000) GS:ffff8f8f3e200000(0000) knlGS:0000000000000000 [ 218.956286] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 218.962053] CR2: ffff8f8f06559dc0 CR3: 0000000002ef4000 CR4: 00000000001006f0 [ 218.969208] Call Trace: [ 218.971678] ? hd44780_common_clear_display+0x17/0x30 [hd44780_common] [ 218.978252] ? charlcd_write_char+0x21a/0x810 [charlcd] [ 218.983519] ? charlcd_puts+0x30/0x60 [charlcd] [ 218.988083] ? charlcd_unregister+0x24/0x70 [charlcd] [ 218.993167] ? hd44780_remove+0x1e/0x30 [hd44780] [ 218.997901] ? platform_remove+0x1f/0x40 ... Just for your information and with hope that somebody may test and/or reproduce this and fix it. Later on I might find time to bisect the other issue I mentioned above. -- With Best Regards, Andy Shevchenko