'struct i2c_algorithm' are not modified in these drivers.

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

More over, dvb_usb_device_properties->i2c_algo seems to only be copied in
i2c_adapter->algo, which is already a "const struct i2c_algorithm".
This is done in dvb_usbv2_i2c_init()

On a x86_64, with allmodconfig, as an example:
Before:
======
   text	   data	    bss	    dec	    hex	filename
  35366	   5832	     36	  41234	   a112	drivers/media/usb/dvb-usb-v2/af9015.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  35430	   5768	     36	  41234	   a112	drivers/media/usb/dvb-usb-v2/af9015.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
--
Compile tested only
---
 drivers/media/usb/dvb-usb-v2/af9015.c   | 2 +-
 drivers/media/usb/dvb-usb-v2/af9035.c   | 2 +-
 drivers/media/usb/dvb-usb-v2/anysee.c   | 2 +-
 drivers/media/usb/dvb-usb-v2/au6610.c   | 2 +-
 drivers/media/usb/dvb-usb-v2/az6007.c   | 2 +-
 drivers/media/usb/dvb-usb-v2/ce6230.c   | 2 +-
 drivers/media/usb/dvb-usb-v2/dvb_usb.h  | 2 +-
 drivers/media/usb/dvb-usb-v2/dvbsky.c   | 2 +-
 drivers/media/usb/dvb-usb-v2/ec168.c    | 2 +-
 drivers/media/usb/dvb-usb-v2/gl861.c    | 2 +-
 drivers/media/usb/dvb-usb-v2/lmedm04.c  | 2 +-
 drivers/media/usb/dvb-usb-v2/mxl111sf.c | 2 +-
 drivers/media/usb/dvb-usb-v2/rtl28xxu.c | 2 +-
 13 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/media/usb/dvb-usb-v2/af9015.c b/drivers/media/usb/dvb-usb-v2/af9015.c
index 4014f7d07330..3eddc40377bf 100644
--- a/drivers/media/usb/dvb-usb-v2/af9015.c
+++ b/drivers/media/usb/dvb-usb-v2/af9015.c
@@ -260,7 +260,7 @@ static u32 af9015_i2c_func(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm af9015_i2c_algo = {
+static const struct i2c_algorithm af9015_i2c_algo = {
 	.master_xfer = af9015_i2c_xfer,
 	.functionality = af9015_i2c_func,
 };
diff --git a/drivers/media/usb/dvb-usb-v2/af9035.c b/drivers/media/usb/dvb-usb-v2/af9035.c
index 0d2c42819d39..04e8bdf0acf4 100644
--- a/drivers/media/usb/dvb-usb-v2/af9035.c
+++ b/drivers/media/usb/dvb-usb-v2/af9035.c
@@ -477,7 +477,7 @@ static u32 af9035_i2c_functionality(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm af9035_i2c_algo = {
+static const struct i2c_algorithm af9035_i2c_algo = {
 	.master_xfer = af9035_i2c_master_xfer,
 	.functionality = af9035_i2c_functionality,
 };
diff --git a/drivers/media/usb/dvb-usb-v2/anysee.c b/drivers/media/usb/dvb-usb-v2/anysee.c
index 8699846eb416..12b6d0ac9049 100644
--- a/drivers/media/usb/dvb-usb-v2/anysee.c
+++ b/drivers/media/usb/dvb-usb-v2/anysee.c
@@ -244,7 +244,7 @@ static u32 anysee_i2c_func(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm anysee_i2c_algo = {
+static const struct i2c_algorithm anysee_i2c_algo = {
 	.master_xfer   = anysee_master_xfer,
 	.functionality = anysee_i2c_func,
 };
diff --git a/drivers/media/usb/dvb-usb-v2/au6610.c b/drivers/media/usb/dvb-usb-v2/au6610.c
index be223fc8aa14..c20a9469f564 100644
--- a/drivers/media/usb/dvb-usb-v2/au6610.c
+++ b/drivers/media/usb/dvb-usb-v2/au6610.c
@@ -115,7 +115,7 @@ static u32 au6610_i2c_func(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm au6610_i2c_algo = {
+static const struct i2c_algorithm au6610_i2c_algo = {
 	.master_xfer   = au6610_i2c_xfer,
 	.functionality = au6610_i2c_func,
 };
diff --git a/drivers/media/usb/dvb-usb-v2/az6007.c b/drivers/media/usb/dvb-usb-v2/az6007.c
index 2410054ddb2c..65ef045b74ca 100644
--- a/drivers/media/usb/dvb-usb-v2/az6007.c
+++ b/drivers/media/usb/dvb-usb-v2/az6007.c
@@ -838,7 +838,7 @@ static u32 az6007_i2c_func(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm az6007_i2c_algo = {
+static const struct i2c_algorithm az6007_i2c_algo = {
 	.master_xfer = az6007_i2c_xfer,
 	.functionality = az6007_i2c_func,
 };
diff --git a/drivers/media/usb/dvb-usb-v2/ce6230.c b/drivers/media/usb/dvb-usb-v2/ce6230.c
index d3b5cb4a24da..7ebaf3ee4491 100644
--- a/drivers/media/usb/dvb-usb-v2/ce6230.c
+++ b/drivers/media/usb/dvb-usb-v2/ce6230.c
@@ -154,7 +154,7 @@ static u32 ce6230_i2c_functionality(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm ce6230_i2c_algorithm = {
+static const struct i2c_algorithm ce6230_i2c_algorithm = {
 	.master_xfer   = ce6230_i2c_master_xfer,
 	.functionality = ce6230_i2c_functionality,
 };
diff --git a/drivers/media/usb/dvb-usb-v2/dvb_usb.h b/drivers/media/usb/dvb-usb-v2/dvb_usb.h
index 288c15a7d72b..ecdc20d45132 100644
--- a/drivers/media/usb/dvb-usb-v2/dvb_usb.h
+++ b/drivers/media/usb/dvb-usb-v2/dvb_usb.h
@@ -243,7 +243,7 @@ struct dvb_usb_device_properties {
 	int (*download_firmware) (struct dvb_usb_device *,
 			const struct firmware *);
 
-	struct i2c_algorithm *i2c_algo;
+	const struct i2c_algorithm *i2c_algo;
 
 	unsigned int num_adapters;
 	int (*get_adapter_count) (struct dvb_usb_device *);
diff --git a/drivers/media/usb/dvb-usb-v2/dvbsky.c b/drivers/media/usb/dvb-usb-v2/dvbsky.c
index 1221c924312a..ceac0ea21dab 100644
--- a/drivers/media/usb/dvb-usb-v2/dvbsky.c
+++ b/drivers/media/usb/dvb-usb-v2/dvbsky.c
@@ -169,7 +169,7 @@ static u32 dvbsky_i2c_func(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm dvbsky_i2c_algo = {
+static const struct i2c_algorithm dvbsky_i2c_algo = {
 	.master_xfer   = dvbsky_i2c_xfer,
 	.functionality = dvbsky_i2c_func,
 };
diff --git a/drivers/media/usb/dvb-usb-v2/ec168.c b/drivers/media/usb/dvb-usb-v2/ec168.c
index 0e4773fc025c..973b32356b17 100644
--- a/drivers/media/usb/dvb-usb-v2/ec168.c
+++ b/drivers/media/usb/dvb-usb-v2/ec168.c
@@ -176,7 +176,7 @@ static u32 ec168_i2c_func(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm ec168_i2c_algo = {
+static const struct i2c_algorithm ec168_i2c_algo = {
 	.master_xfer   = ec168_i2c_xfer,
 	.functionality = ec168_i2c_func,
 };
diff --git a/drivers/media/usb/dvb-usb-v2/gl861.c b/drivers/media/usb/dvb-usb-v2/gl861.c
index c71e7b93476d..0538170ccf29 100644
--- a/drivers/media/usb/dvb-usb-v2/gl861.c
+++ b/drivers/media/usb/dvb-usb-v2/gl861.c
@@ -162,7 +162,7 @@ static u32 gl861_i2c_functionality(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm gl861_i2c_algo = {
+static const struct i2c_algorithm gl861_i2c_algo = {
 	.master_xfer   = gl861_i2c_master_xfer,
 	.functionality = gl861_i2c_functionality,
 };
diff --git a/drivers/media/usb/dvb-usb-v2/lmedm04.c b/drivers/media/usb/dvb-usb-v2/lmedm04.c
index 8a34e6c0d6a6..c9aa77ff088f 100644
--- a/drivers/media/usb/dvb-usb-v2/lmedm04.c
+++ b/drivers/media/usb/dvb-usb-v2/lmedm04.c
@@ -549,7 +549,7 @@ static u32 lme2510_i2c_func(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm lme2510_i2c_algo = {
+static const struct i2c_algorithm lme2510_i2c_algo = {
 	.master_xfer   = lme2510_i2c_xfer,
 	.functionality = lme2510_i2c_func,
 };
diff --git a/drivers/media/usb/dvb-usb-v2/mxl111sf.c b/drivers/media/usb/dvb-usb-v2/mxl111sf.c
index cd5861a30b6f..870ac3c8b085 100644
--- a/drivers/media/usb/dvb-usb-v2/mxl111sf.c
+++ b/drivers/media/usb/dvb-usb-v2/mxl111sf.c
@@ -911,7 +911,7 @@ static u32 mxl111sf_i2c_func(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm mxl111sf_i2c_algo = {
+static const struct i2c_algorithm mxl111sf_i2c_algo = {
 	.master_xfer   = mxl111sf_i2c_xfer,
 	.functionality = mxl111sf_i2c_func,
 #ifdef NEED_ALGO_CONTROL
diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
index f7884bb56fcc..487c6ab784ab 100644
--- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
+++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
@@ -290,7 +290,7 @@ static u32 rtl28xxu_i2c_func(struct i2c_adapter *adapter)
 	return I2C_FUNC_I2C;
 }
 
-static struct i2c_algorithm rtl28xxu_i2c_algo = {
+static const struct i2c_algorithm rtl28xxu_i2c_algo = {
 	.master_xfer   = rtl28xxu_i2c_xfer,
 	.functionality = rtl28xxu_i2c_func,
 };
-- 
2.46.0