linux-kernel - Re: [cdrom_check_status] BUG: unable to handle kernel NULL pointer dereference at 000001c0

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Message-id: <2347287.gTWU6fzh5s@amdc3058>
Date:   Wed, 08 Nov 2017 17:50:41 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Fengguang Wu <fengguang.wu@...el.com>
Cc:     linux-ide@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        "David S. Miller" <davem@...emloft.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [cdrom_check_status] BUG: unable to handle kernel NULL pointer
 dereference at 000001c0

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