[PATCH] i2c: virtio: Constify struct i2c_algorithm and struct virtio_device_id

[Christophe JAILLET]

'struct i2c_algorithm' and 'struct virtio_device_id' are not modified in
this driver.

Constifying this structure moves some data to a read-only section, so
increase overall security, especially when the structure holds some
function pointers, which is the case for struct i2c_algorithm.

On a x86_64, with allmodconfig:
Before:
======
   text    data     bss     dec     hex filename
   6663     568      16    7247    1c4f drivers/i2c/busses/i2c-virtio.o

After:
=====
   text    data     bss     dec     hex filename
   6735     472      16    7223    1c37 drivers/i2c/busses/i2c-virtio.o

Signed-off-by: Christophe JAILLET <christophe.jail...@wanadoo.fr>
--
Compile tested only
---
 drivers/i2c/busses/i2c-virtio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-virtio.c b/drivers/i2c/busses/i2c-virtio.c
index 52ba1e0845ca..2a351f961b89 100644
--- a/drivers/i2c/busses/i2c-virtio.c
+++ b/drivers/i2c/busses/i2c-virtio.c
@@ -182,7 +182,7 @@ static u32 virtio_i2c_func(struct i2c_adapter *adap)
        return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 }
 
-static struct i2c_algorithm virtio_algorithm = {
+static const struct i2c_algorithm virtio_algorithm = {
        .xfer = virtio_i2c_xfer,
        .functionality = virtio_i2c_func,
 };
@@ -237,7 +237,7 @@ static void virtio_i2c_remove(struct virtio_device *vdev)
        virtio_i2c_del_vqs(vdev);
 }
 
-static struct virtio_device_id id_table[] = {
+static const struct virtio_device_id id_table[] = {
        { VIRTIO_ID_I2C_ADAPTER, VIRTIO_DEV_ANY_ID },
        {}
 };
-- 
2.46.0