[PATCH] dib9000: constify i2c_algorithm structure

From: Gustavo A. R. Silva
Date: Sun Jul 09 2017 - 18:25:03 EST


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@xxxxxxxxxxxxxx>
---
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