From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bartlomiej Zolnierkiewicz Subject: Re: [cdrom_check_status] BUG: unable to handle kernel NULL pointer dereference at 000001c0 Date: Wed, 08 Nov 2017 17:50:41 +0100 Message-ID: <2347287.gTWU6fzh5s@amdc3058> References: <20171107102538.mzbfdxll3fpf2kqg@wfg-t540p.sh.intel.com> <7885793.0mqNGdeUvE@amdc3058> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: Received: from mailout4.samsung.com ([203.254.224.34]:15584 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752256AbdKHQur (ORCPT ); Wed, 8 Nov 2017 11:50:47 -0500 In-reply-to: <7885793.0mqNGdeUvE@amdc3058> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Fengguang Wu Cc: linux-ide@vger.kernel.org, Borislav Petkov , "David S. Miller" , Linus Torvalds , Jens Axboe , Bart Van Assche , linux-kernel@vger.kernel.org On Wednesday, November 08, 2017 05:28:16 PM Bartlomiej Zolnierkiewicz wrote: > we can see that for some reason PIIX PCI IDE controller is probed > twice and later when we attach ide-cd driver to both instances of hdc > (in parallel) it ends up badly.. Actually it ends up badly later (I don't know exactly yet how we get into this situation but this is not that important as we know that the root problem starts much earlier with the double probe of PCI IDE host controller).. Best regards, -- Bartlomiej Zolnierkiewicz Samsung R&D Institute Poland Samsung Electronics