linux-kernel - [PATCH 2/5] block: make USB device id constant

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Date:	Sun, 10 Jan 2010 13:39:39 +0100
From:	Németh Márton <nm127@...email.hu>
To:	Jens Axboe <axboe@...nel.dk>
CC:	LKML <linux-kernel@...r.kernel.org>, Julia Lawall <julia@...u.dk>,
	cocci@...u.dk
Subject: [PATCH 2/5] block: 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 ub_usb_ids 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/block/ub.c b/drivers/block/ub.c
--- a/drivers/block/ub.c 2009-12-03 04:51:21.000000000 +0100
+++ b/drivers/block/ub.c 2010-01-08 09:14:49.000000000 +0100
@@ -393,7 +393,7 @@ static int ub_probe_lun(struct ub_dev *s
 #define ub_usb_ids  usb_storage_usb_ids
 #else

-static struct usb_device_id ub_usb_ids[] = {
+static const struct usb_device_id ub_usb_ids[] = {
 	{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) },
 	{ }
 };
--
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