linux-kernel - Re: [PATCH] isdn: make USB device id constant

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Date:	Tue, 12 Jan 2010 15:35:34 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Németh Márton <nm127@...email.hu>
CC:	Karsten Keil <isdn@...ux-pingi.de>,
	isdn4linux@...tserv.isdn4linux.de,
	LKML <linux-kernel@...r.kernel.org>,
	Julia Lawall <julia@...u.dk>, cocci@...u.dk
Subject: Re: [PATCH] isdn: make USB device id constant

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Please provide a diffstat next time so that I don't have to scan
the entire patch in order to see which source files it touches.

Thanks,
Tilman

Am 2010-01-12 08:52 schrieb Németh Márton:
> From: Márton Németh <nm127@...email.hu>
> 
> The id_table field of the struct usb_device_id is constant in <linux/usb.h>
> so it is worth to make the initialization data also constant.
> 
> The semantic match that finds this kind of pattern is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @r@
> disable decl_init,const_decl_init;
> identifier I1, I2, x;
> @@
> 	struct I1 {
> 	  ...
> 	  const struct I2 *x;
> 	  ...
> 	};
> @s@
> identifier r.I1, y;
> identifier r.x, E;
> @@
> 	struct I1 y = {
> 	  .x = E,
> 	};
> @c@
> identifier r.I2;
> identifier s.E;
> @@
> 	const struct I2 E[] = ... ;
> @depends on !c@
> identifier r.I2;
> identifier s.E;
> @@
> +	const
> 	struct I2 E[] = ...;
> // </smpl>
> 
> Signed-off-by: Márton Németh <nm127@...email.hu>
> Cc: Julia Lawall <julia@...u.dk>
> Cc: cocci@...u.dk
> ---
> diff -u -p a/drivers/isdn/hardware/mISDN/hfcsusb.h b/drivers/isdn/hardware/mISDN/hfcsusb.h
> --- a/drivers/isdn/hardware/mISDN/hfcsusb.h 2010-01-07 19:08:40.000000000 +0100
> +++ b/drivers/isdn/hardware/mISDN/hfcsusb.h 2010-01-08 13:36:54.000000000 +0100
> @@ -337,7 +337,7 @@ static const char *HFC_NT_LAYER1_STATES[
>  };
> 
>  /* supported devices */
> -static struct usb_device_id hfcsusb_idtab[] = {
> +static const struct usb_device_id hfcsusb_idtab[] = {
>  	{
>  	 USB_DEVICE(0x0959, 0x2bd0),
>  	 .driver_info = (unsigned long) &((struct hfcsusb_vdata)
> diff -u -p a/drivers/isdn/hisax/hfc_usb.c b/drivers/isdn/hisax/hfc_usb.c
> --- a/drivers/isdn/hisax/hfc_usb.c 2010-01-07 19:08:40.000000000 +0100
> +++ b/drivers/isdn/hisax/hfc_usb.c 2010-01-08 13:49:53.000000000 +0100
> @@ -64,7 +64,7 @@ typedef struct {
>  } hfcsusb_vdata;
> 
>  /* VID/PID device list */
> -static struct usb_device_id hfcusb_idtab[] = {
> +static const struct usb_device_id hfcusb_idtab[] = {
>  	{
>  	 USB_DEVICE(0x0959, 0x2bd0),
>  	 .driver_info = (unsigned long) &((hfcsusb_vdata)
> diff -u -p a/drivers/isdn/hisax/st5481_init.c b/drivers/isdn/hisax/st5481_init.c
> --- a/drivers/isdn/hisax/st5481_init.c 2009-12-03 04:51:21.000000000 +0100
> +++ b/drivers/isdn/hisax/st5481_init.c 2010-01-08 13:50:45.000000000 +0100
> @@ -160,7 +160,7 @@ static void disconnect_st5481(struct usb
>  /*
>   * The last 4 bits in the Product Id is set with 4 pins on the chip.
>   */
> -static struct usb_device_id st5481_ids[] = {
> +static const struct usb_device_id st5481_ids[] = {
>  	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x0) },
>  	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x1) },
>  	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID+0x2) },
> --
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- -- 
Tilman Schmidt                    E-Mail: tilman@...p.cc
Bonn, Germany
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