linux-kernel - Re: [PATCH] input: touchscreen: fix wm97xx-ts exit path

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Date:   Mon, 15 Oct 2018 11:17:46 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
        Mark Brown <broonie@...nel.org>, patches@...nsource.cirrus.com
Subject: Re: [PATCH] input: touchscreen: fix wm97xx-ts exit path

On Sat, Oct 13, 2018 at 10:06:18AM -0700, Randy Dunlap wrote:
> From: Randy Dunlap <rdunlap@...radead.org>
> 
> Loading then unloading wm97xx-ts.ko when CONFIG_AC97_BUS=m
> causes a WARNING: from drivers/base/driver.c:
> 
> Unexpected driver unregister!
> WARNING: CPU: 0 PID: 1709 at ../drivers/base/driver.c:193 driver_unregister+0x30/0x40
> 
> Fix this by only calling driver_unregister() with the same
> condition that driver_register() is called.
> 
> Fixes: ae9d1b5fbd7b ("Input: wm97xx: add new AC97 bus support")
> 
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Robert Jarzmik <robert.jarzmik@...e.fr>
> Cc: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: Mark Brown <broonie@...nel.org>
> Cc: patches@...nsource.cirrus.com
> Cc: linux-input@...r.kernel.org

Applied, thank you.

> ---
>  drivers/input/touchscreen/wm97xx-core.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> --- lnx-419-rc7.orig/drivers/input/touchscreen/wm97xx-core.c
> +++ lnx-419-rc7/drivers/input/touchscreen/wm97xx-core.c
> @@ -929,7 +929,8 @@ static int __init wm97xx_init(void)
>  
>  static void __exit wm97xx_exit(void)
>  {
> -	driver_unregister(&wm97xx_driver);
> +	if (IS_BUILTIN(CONFIG_AC97_BUS))
> +		driver_unregister(&wm97xx_driver);
>  	platform_driver_unregister(&wm97xx_mfd_driver);
>  }
>  
> 
> 

-- 
Dmitry