linux-kernel - [PATCH] gpio: make PCI device id constant

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Date:	Sun, 10 Jan 2010 13:13:55 +0100
From:	Németh Márton <nm127@...email.hu>
To:	Michael Buesch <mb@...sch.de>
CC:	LKML <linux-kernel@...r.kernel.org>, Julia Lawall <julia@...u.dk>,
	cocci@...u.dk
Subject: [PATCH] gpio: make PCI device id constant

From: Márton Németh <nm127@...email.hu>

The id_table field of the struct pci_driver is constant in <linux/pci.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/gpio/langwell_gpio.c b/drivers/gpio/langwell_gpio.c
--- a/drivers/gpio/langwell_gpio.c 2010-01-07 19:08:39.000000000 +0100
+++ b/drivers/gpio/langwell_gpio.c 2010-01-08 07:52:43.000000000 +0100
@@ -157,7 +157,7 @@ static struct irq_chip lnw_irqchip = {
 	.set_type	= lnw_irq_type,
 };

-static struct pci_device_id lnw_gpio_ids[] = {
+static const struct pci_device_id lnw_gpio_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f) },
 	{ 0, }
 };
diff -u -p a/drivers/gpio/bt8xxgpio.c b/drivers/gpio/bt8xxgpio.c
--- a/drivers/gpio/bt8xxgpio.c 2009-12-03 04:51:21.000000000 +0100
+++ b/drivers/gpio/bt8xxgpio.c 2010-01-08 07:53:33.000000000 +0100
@@ -312,7 +312,7 @@ static int bt8xxgpio_resume(struct pci_d
 #define bt8xxgpio_resume NULL
 #endif /* CONFIG_PM */

-static struct pci_device_id bt8xxgpio_pci_tbl[] = {
+static const struct pci_device_id bt8xxgpio_pci_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT849) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT878) },
--
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