linux-kernel - [PATCH] watchdog: ts72xx_wdt: constify watchdog

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Date:   Fri, 7 Jul 2017 19:18:40 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Wim Van Sebroeck <wim@...ana.be>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] watchdog: ts72xx_wdt: constify watchdog_ops structure

Check for watchdog_ops structures that are only stored in the ops field of
a watchdog_device structure. This field is declared const, so watchdog_ops
structures that have this property can be declared as const also.

This issue was detected using Coccinelle and the following semantic patch:

@r
disable optional_qualifier@
identifier i;
position p;
@@
static struct watchdog_ops i@p = { ... };

@ok@
identifier r.i;
struct watchdog_device e;
position p;
@@
e.ops = &i@p;

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

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct watchdog_ops i = { ... };

Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 drivers/watchdog/ts72xx_wdt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/watchdog/ts72xx_wdt.c b/drivers/watchdog/ts72xx_wdt.c
index 17c25da..811e43c 100644
--- a/drivers/watchdog/ts72xx_wdt.c
+++ b/drivers/watchdog/ts72xx_wdt.c
@@ -112,7 +112,7 @@ static const struct watchdog_info ts72xx_wdt_ident = {
 	.identity		= "TS-72XX WDT",
 };
 
-static struct watchdog_ops ts72xx_wdt_ops = {
+static const struct watchdog_ops ts72xx_wdt_ops = {
 	.owner		= THIS_MODULE,
 	.start		= ts72xx_wdt_start,
 	.stop		= ts72xx_wdt_stop,
-- 
2.5.0