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Subject[PATCH] hid: make USB device id constant
From: Márton Németh <nm127@freemail.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@freemail.hu>
Cc: Julia Lawall <julia@diku.dk>
Cc: cocci@diku.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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