linux-kernel - Re: [PATCH] Input: wm97xx: only unregister wm97xx

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Message-ID: <20180905091609.GC1653@imbe.wolfsonmicro.main>
Date:   Wed, 5 Sep 2018 10:16:09 +0100
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     Colin King <colin.king@...onical.com>
CC:     Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Mark Brown <broonie@...nel.org>,
        "Mauro Carvalho Chehab" <mchehab+samsung@...nel.org>,
        <patches@...nsource.cirrus.com>, <linux-input@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Input: wm97xx: only unregister wm97xx_driver if it has
 been registered

On Tue, Sep 04, 2018 at 07:35:05PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> In the case where IS_BUILTIN(CONFIG_AC97_BUS)) is not true, the
> wm97xx_driver driver is being unregistered even it has not been
> previously registered.  Fix this by only unregistering it if
> IS_BUILTIN(CONFIG_AC97_BUS)) is true.  This fixes the warning
> message:
> 
> [  834.111248] ------------[ cut here ]------------
> [  834.111248] Unexpected driver unregister!
> [  834.111319] WARNING: CPU: 2 PID: 11749 at drivers/base/driver.c:193 driver_unregister+0x3b/0x40
> [  834.111319] Modules linked in: wm97xx_ts(-) ....
> 
> ..and a stack trace.
> 
> To easily reproduce this, load and unload the module on a system where
> the hardware is not supported.
> 
> Fixes: ae9d1b5fbd7b ("Input: wm97xx: add new AC97 bus support")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---

Acked-by: Charles Keepax <ckeepax@...nsource.cirrus.com>

Thanks,
Charles