linux-kernel - Re: [PATCH 4/5] drivers/tty: make serial/mpsc.c driver explicitly non-modular

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Date:	Fri, 9 Oct 2015 15:38:32 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org
Subject: Re: [PATCH 4/5] drivers/tty: make serial/mpsc.c driver explicitly
 non-modular

On Wed, Aug 19, 2015 at 05:48:08PM -0400, Paul Gortmaker wrote:
> The Kconfig for this driver is currently:
> 
> config SERIAL_MPSC
>         bool "Marvell MPSC serial port support"
> 
> ...meaning that it currently is not being built as a module by anyone.
> Lets remove the modular code that is essentially orphaned, so that
> when reading the driver there is no doubt it is builtin-only.
> 
> Since module_init translates to device_initcall in the non-modular
> case, the init ordering remains unchanged with this commit.
> 
> We leave some tags like MODULE_AUTHOR for documentation purposes.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Jiri Slaby <jslaby@...e.com>
> Cc: linux-serial@...r.kernel.org
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
>  drivers/tty/serial/mpsc.c | 36 +++---------------------------------
>  1 file changed, 3 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/tty/serial/mpsc.c b/drivers/tty/serial/mpsc.c
> index 82bb6d1fe23b..edb32e3f1e84 100644
> --- a/drivers/tty/serial/mpsc.c
> +++ b/drivers/tty/serial/mpsc.c
> @@ -55,8 +55,6 @@
>  #define SUPPORT_SYSRQ
>  #endif
>  
> -#include <linux/module.h>
> -#include <linux/moduleparam.h>
>  #include <linux/tty.h>
>  #include <linux/tty_flip.h>
>  #include <linux/ioport.h>
> @@ -2108,24 +2106,8 @@ static int mpsc_drv_probe(struct platform_device *dev)
>  	return rc;
>  }
>  
> -static int mpsc_drv_remove(struct platform_device *dev)
> -{
> -	pr_debug("mpsc_drv_exit: Removing MPSC %d\n", dev->id);
> -
> -	if (dev->id < MPSC_NUM_CTLRS) {
> -		uart_remove_one_port(&mpsc_reg, &mpsc_ports[dev->id].port);
> -		mpsc_release_port((struct uart_port *)
> -				&mpsc_ports[dev->id].port);
> -		mpsc_drv_unmap_regs(&mpsc_ports[dev->id]);
> -		return 0;
> -	} else {
> -		return -ENODEV;
> -	}
> -}
> -
>  static struct platform_driver mpsc_driver = {
>  	.probe	= mpsc_drv_probe,
> -	.remove	= mpsc_drv_remove,
>  	.driver	= {
>  		.name	= MPSC_CTLR_NAME,
>  	},

I don't think this is right. The driver can always be unbound from the
device via sysfs, in which case it will now leak resources and leave
behind a dangling UART port.

Thierry

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