linux-kernel - [PATCH] dib9000: constify i2c

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Message-ID: <20170709222419.GA11009@embeddedgus>
Date:   Sun, 9 Jul 2017 17:24:19 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] dib9000: constify i2c_algorithm structure

Check for i2c_algorithm structures that are only stored in
the algo field of an i2c_adapter structure. This field is
declared const, so i2c_algorithm structures that have this
property can be declared as const also.

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

@r disable optional_qualifier@
identifier i;
position p;
@@
static struct i2c_algorithm i@p = { ... };

@ok@
identifier r.i;
struct i2c_adapter e;
position p;
@@
e.algo = &i@p;

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

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct i2c_algorithm i = { ... };

Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 drivers/media/dvb-frontends/dib9000.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/dvb-frontends/dib9000.c b/drivers/media/dvb-frontends/dib9000.c
index c95fff4..17c6f15 100644
--- a/drivers/media/dvb-frontends/dib9000.c
+++ b/drivers/media/dvb-frontends/dib9000.c
@@ -1714,12 +1714,12 @@ static u32 dib9000_i2c_func(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm dib9000_tuner_algo = {
+static const struct i2c_algorithm dib9000_tuner_algo = {
 	.master_xfer = dib9000_tuner_xfer,
 	.functionality = dib9000_i2c_func,
 };
 
-static struct i2c_algorithm dib9000_component_bus_algo = {
+static const struct i2c_algorithm dib9000_component_bus_algo = {
 	.master_xfer = dib9000_fw_component_bus_xfer,
 	.functionality = dib9000_i2c_func,
 };
-- 
2.5.0