Re: [PATCH] watchdog: coh901327_wdt: constify watchdog_ops structure

From: Guenter Roeck
Date: Fri Jul 07 2017 - 21:45:41 EST


On 07/07/2017 05:33 PM, Gustavo A. R. Silva wrote:
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@xxxxxxxxxxxxxx>

Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>

---
drivers/watchdog/coh901327_wdt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/watchdog/coh901327_wdt.c b/drivers/watchdog/coh901327_wdt.c
index 38dd60f0..4410337 100644
--- a/drivers/watchdog/coh901327_wdt.c
+++ b/drivers/watchdog/coh901327_wdt.c
@@ -218,7 +218,7 @@ static const struct watchdog_info coh901327_ident = {
.identity = DRV_NAME,
};
-static struct watchdog_ops coh901327_ops = {
+static const struct watchdog_ops coh901327_ops = {
.owner = THIS_MODULE,
.start = coh901327_start,
.stop = coh901327_stop,