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

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Message-ID: <4B4A076A.8020207@freemail.hu>
Date:	Sun, 10 Jan 2010 17:59:22 +0100
From:	Németh Márton <nm127@...email.hu>
To:	Jiri Kosina <jkosina@...e.cz>
CC:	linux-input@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Julia Lawall <julia@...u.dk>, cocci@...u.dk
Subject: [PATCH] hid: make USB device id constant

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/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
--- a/drivers/hid/usbhid/hid-core.c 2010-01-07 19:08:40.000000000 +0100
+++ b/drivers/hid/usbhid/hid-core.c 2010-01-08 18:55:16.000000000 +0100
@@ -1342,7 +1342,7 @@ static int hid_reset_resume(struct usb_i

 #endif /* CONFIG_PM */

-static struct usb_device_id hid_usb_ids [] = {
+static const struct usb_device_id hid_usb_ids[] = {
 	{ .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
 		.bInterfaceClass = USB_INTERFACE_CLASS_HID },
 	{ }						/* Terminating entry */
--
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