linux-kernel - [PATCH 6/9] USB hub: make USB device id constant

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Date:	Sun, 10 Jan 2010 15:34:53 +0100
From:	Németh Márton <nm127@...email.hu>
To:	Greg Kroah-Hartman <gregkh@...e.de>
CC:	linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Julia Lawall <julia@...u.dk>, cocci@...u.dk
Subject: [PATCH 6/9] USB hub: 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/usb/core/hub.c b/drivers/usb/core/hub.c
--- a/drivers/usb/core/hub.c 2010-01-07 19:08:47.000000000 +0100
+++ b/drivers/usb/core/hub.c 2010-01-08 17:20:19.000000000 +0100
@@ -3442,7 +3442,7 @@ static int hub_thread(void *__unused)
 	return 0;
 }

-static struct usb_device_id hub_id_table [] = {
+static const struct usb_device_id hub_id_table[] = {
     { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
       .bDeviceClass = USB_CLASS_HUB},
     { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
--
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