linux-kernel - [PATCH 2/6] mfd: sm501: constify gpio

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Date:   Sun, 11 Sep 2016 14:14:38 +0200
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/6] mfd: sm501: constify gpio_chip structures

These structures are only used to copy into other structures, so declare
them as const.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct gpio_chip i@p = { ... };

@ok@
identifier r.i;
expression e;
position p;
@@
e = i@p;

@bad@
position p != {r.p,ok.p};
identifier r.i;
struct gpio_chip e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct gpio_chip i = { ... };
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/mfd/sm501.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index 65cd0d2..4053435 100644
--- a/drivers/mfd/sm501.c
+++ b/drivers/mfd/sm501.c
@@ -1001,7 +1001,7 @@ static int sm501_gpio_output(struct gpio_chip *chip,
 	return 0;
 }
 
-static struct gpio_chip gpio_chip_template = {
+static const struct gpio_chip gpio_chip_template = {
 	.ngpio			= 32,
 	.direction_input	= sm501_gpio_input,
 	.direction_output	= sm501_gpio_output,