linux-kernel - [PATCH 3/3] power: supply: Constify static w1_family

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Message-Id: <20201004193202.4044-4-rikard.falkeborn@gmail.com>
Date:   Sun,  4 Oct 2020 21:32:02 +0200
From:   Rikard Falkeborn <rikard.falkeborn@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Rikard Falkeborn <rikard.falkeborn@...il.com>,
        Sebastian Reichel <sre@...nel.org>, linux-pm@...r.kernel.org
Subject: [PATCH 3/3] power: supply: Constify static w1_family_ops structs

The only usage of these structs is to assign their address to the fops
field in the w1_family struct, which is a const pointer. Make them const
to allow the compiler to put them in read-only memory.

This was done with the following Coccinelle semantic patch
(http://coccinelle.lip6.fr/):

// <smpl>
@r1 disable optional_qualifier @
identifier i;
position p;
@@
static struct w1_family_ops i@p = {...};

@ok1@
identifier r1.i;
position p;
identifier s;
@@
static struct w1_family s = {
	.fops=&i@p,
};

@bad1@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p

@depends on !bad1 disable optional_qualifier@
identifier r1.i;
@@
static
+const
struct w1_family_ops i={};
// </smpl>

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@...il.com>
---
 drivers/power/supply/bq27xxx_battery_hdq.c | 2 +-
 drivers/power/supply/ds2760_battery.c      | 2 +-
 drivers/power/supply/max1721x_battery.c    | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/power/supply/bq27xxx_battery_hdq.c b/drivers/power/supply/bq27xxx_battery_hdq.c
index 12b10dad77d3..922759ab2e04 100644
--- a/drivers/power/supply/bq27xxx_battery_hdq.c
+++ b/drivers/power/supply/bq27xxx_battery_hdq.c
@@ -97,7 +97,7 @@ static void bq27xxx_battery_hdq_remove_slave(struct w1_slave *sl)
 	bq27xxx_battery_teardown(di);
 }
 
-static struct w1_family_ops bq27xxx_battery_hdq_fops = {
+static const struct w1_family_ops bq27xxx_battery_hdq_fops = {
 	.add_slave	= bq27xxx_battery_hdq_add_slave,
 	.remove_slave	= bq27xxx_battery_hdq_remove_slave,
 };
diff --git a/drivers/power/supply/ds2760_battery.c b/drivers/power/supply/ds2760_battery.c
index 11bed88a89fa..695bb6747400 100644
--- a/drivers/power/supply/ds2760_battery.c
+++ b/drivers/power/supply/ds2760_battery.c
@@ -795,7 +795,7 @@ static const struct of_device_id w1_ds2760_of_ids[] = {
 };
 #endif
 
-static struct w1_family_ops w1_ds2760_fops = {
+static const struct w1_family_ops w1_ds2760_fops = {
 	.add_slave	= w1_ds2760_add_slave,
 	.remove_slave	= w1_ds2760_remove_slave,
 	.groups		= w1_ds2760_groups,
diff --git a/drivers/power/supply/max1721x_battery.c b/drivers/power/supply/max1721x_battery.c
index 9ca895b0dabb..1b1a36f8e929 100644
--- a/drivers/power/supply/max1721x_battery.c
+++ b/drivers/power/supply/max1721x_battery.c
@@ -431,7 +431,7 @@ static int devm_w1_max1721x_add_device(struct w1_slave *sl)
 	return 0;
 }
 
-static struct w1_family_ops w1_max1721x_fops = {
+static const struct w1_family_ops w1_max1721x_fops = {
 	.add_slave = devm_w1_max1721x_add_device,
 };
 
-- 
2.28.0