linux-kernel - Re: [PATCH 2/2] add device function for usb serial console

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Message-Id: <20081114143643.c79cfc0c.akpm@linux-foundation.org>
Date:	Fri, 14 Nov 2008 14:36:43 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kevin Hao <kexin.hao@...driver.com>
Cc:	linux-kernel@...r.kernel.org, gregkh@...e.de, alan@...hat.com,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/2] add device function for usb serial console

On Thu, 13 Nov 2008 09:53:37 +0800
Kevin Hao <kexin.hao@...driver.com> wrote:

> Add device funtion for usb serial console, so we can open /dev/console
> when we use a usb serial device as console.
> 
> Signed-off-by: Kevin Hao <kexin.hao@...driver.com>
> ---
>  drivers/usb/serial/console.c |   13 +++++++++++++
>  1 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/usb/serial/console.c b/drivers/usb/serial/console.c
> index 5b95009..1dbb203 100644
> --- a/drivers/usb/serial/console.c
> +++ b/drivers/usb/serial/console.c
> @@ -241,12 +241,25 @@ static void usb_console_write(struct console *co,
>  	}
>  }
>  
> +static struct tty_driver *usb_console_device(struct console *co, int *index)
> +{
> +	struct tty_driver **p = (struct tty_driver **)co->data;

co->data is already void*, hence this cast is unneeded.  It is also
undesirable because it defeats typechecking.

> +
> +	if (!*p)
> +		return NULL;
> +
> +	*index = co->index;
> +	return (struct tty_driver *)(*p);

And *p already has type `struct tty_driver *'.

> +}
> +
>  static struct console usbcons = {
>  	.name =		"ttyUSB",
>  	.write =	usb_console_write,
> +	.device =	usb_console_device,
>  	.setup =	usb_console_setup,
>  	.flags =	CON_PRINTBUFFER,
>  	.index =	-1,
> +	.data = 	&usb_serial_tty_driver,
>  };
>  


--- a/drivers/usb/serial/console.c~usb-serial-console-add-device-function-fix
+++ a/drivers/usb/serial/console.c
@@ -243,13 +243,13 @@ static void usb_console_write(struct con
 
 static struct tty_driver *usb_console_device(struct console *co, int *index)
 {
-	struct tty_driver **p = (struct tty_driver **)co->data;
+	struct tty_driver **p = co->data;
 
 	if (!*p)
 		return NULL;
 
 	*index = co->index;
-	return (struct tty_driver *)(*p);
+	return *p;
 }
 
 static struct console usbcons = {
_

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