From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Subject: Re: [PATCH 1/2 v6] mmc: block: Convert RPMB to a character device
Date: Thu, 28 Sep 2017 14:00:44 +0800
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To: Linus Walleij <linus.walleij@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>, "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>, Ulf Hansson <ulf.hansson@linaro.org>, linux-block <linux-block@vger.kernel.org>, Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@lst.de>, Arnd Bergmann <arnd@arndb.de>, Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>, Paolo Valente <paolo.valente@linaro.org>, Avri Altman <Avri.Altman@sandisk.com>, Tomas Winkler <tomas.winkler@intel.com>

On Wed, 27 Sep 2017 21:45:58 +0200 Linus Walleij wrote:

> On Wed, Sep 27, 2017 at 1:35 PM, Adrian Hunter <adrian.hunter@intel.com> wrote:
> >
> > BUG when removing, fixed by reverting this patch.
> >
> > [  346.548512] mmc1: card 0001 removed
> > [  346.552782] BUG: unable to handle kernel NULL pointer dereference at 0000000000000070  
> 
> How did you achieve this? I need to reproduce it.
> 
> RPMB is only available on eMMC cards and I don't have a removable eMMC
> card since by definition they are soldered on.

Maybe unbind the sdhci host.