[PATCH] ddbridge: constify i2c_algorithm structure

[PATCH] ddbridge: constify i2c_algorithm structure

[Gustavo A. R. Silva]

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@embeddedor.com>
---
 drivers/media/pci/ddbridge/ddbridge-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/pci/ddbridge/ddbridge-core.c b/drivers/media/pci/ddbridge/ddbridge-core.c
index cd1723e..9663a4c 100644
--- a/drivers/media/pci/ddbridge/ddbridge-core.c
+++ b/drivers/media/pci/ddbridge/ddbridge-core.c
@@ -200,7 +200,7 @@ static u32 ddb_i2c_functionality(struct i2c_adapter *adap)
 	return I2C_FUNC_SMBUS_EMUL;
 }
 
-static struct i2c_algorithm ddb_i2c_algo = {
+static const struct i2c_algorithm ddb_i2c_algo = {
 	.master_xfer   = ddb_i2c_master_xfer,
 	.functionality = ddb_i2c_functionality,
 };
-- 
2.5.0

Re: [PATCH] ddbridge: constify i2c_algorithm structure

[Daniel Scheller]

Am Sun, 9 Jul 2017 20:15:36 -0500
schrieb "Gustavo A. R. Silva" <garsilva@embeddedor.com>:

> 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@embeddedor.com>
> ---
>  drivers/media/pci/ddbridge/ddbridge-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/pci/ddbridge/ddbridge-core.c
> b/drivers/media/pci/ddbridge/ddbridge-core.c index cd1723e..9663a4c
> 100644 --- a/drivers/media/pci/ddbridge/ddbridge-core.c
> +++ b/drivers/media/pci/ddbridge/ddbridge-core.c
> @@ -200,7 +200,7 @@ static u32 ddb_i2c_functionality(struct
> i2c_adapter *adap) return I2C_FUNC_SMBUS_EMUL;
>  }
>  
> -static struct i2c_algorithm ddb_i2c_algo = {
> +static const struct i2c_algorithm ddb_i2c_algo = {
>  	.master_xfer   = ddb_i2c_master_xfer,
>  	.functionality = ddb_i2c_functionality,
>  };

Hi Gustavo,
Hi all,

please hold this single one patch from the constify patches back for
now, since we're in the process of bumping the whole driver to a newer
version which involves lots of code shuffling. With this, quite some
GIT rebasing work needs to be done, and adding this one liner at a
later time (thus rebasing it) is way easier.

To be sure this will not be forgotten afterwards, I've already posted a
patch applying the exact change at [1].

Thank you very much!

[1] https://patchwork.linuxtv.org/patch/42393/

Best regards,
Daniel Scheller
-- 
https://github.com/herrnst

Re: [PATCH] ddbridge: constify i2c_algorithm structure

[Gustavo A. R. Silva]

Hi Daniel,


On 07/10/2017 10:16 AM, Daniel Scheller wrote:
> Am Sun, 9 Jul 2017 20:15:36 -0500
> schrieb "Gustavo A. R. Silva" <garsilva@embeddedor.com>:
>
>> 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@embeddedor.com>
>> ---
>>   drivers/media/pci/ddbridge/ddbridge-core.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/pci/ddbridge/ddbridge-core.c
>> b/drivers/media/pci/ddbridge/ddbridge-core.c index cd1723e..9663a4c
>> 100644 --- a/drivers/media/pci/ddbridge/ddbridge-core.c
>> +++ b/drivers/media/pci/ddbridge/ddbridge-core.c
>> @@ -200,7 +200,7 @@ static u32 ddb_i2c_functionality(struct
>> i2c_adapter *adap) return I2C_FUNC_SMBUS_EMUL;
>>   }
>>   
>> -static struct i2c_algorithm ddb_i2c_algo = {
>> +static const struct i2c_algorithm ddb_i2c_algo = {
>>   	.master_xfer   = ddb_i2c_master_xfer,
>>   	.functionality = ddb_i2c_functionality,
>>   };
> Hi Gustavo,
> Hi all,
>
> please hold this single one patch from the constify patches back for
> now, since we're in the process of bumping the whole driver to a newer
> version which involves lots of code shuffling. With this, quite some
> GIT rebasing work needs to be done, and adding this one liner at a
> later time (thus rebasing it) is way easier.
>
> To be sure this will not be forgotten afterwards, I've already posted a
> patch applying the exact change at [1].
>
> Thank you very much!
>
> [1] https://patchwork.linuxtv.org/patch/42393/

Thank you!

-- 
Gustavo A. R. Silva