2021-03-01 13:00:40

by Tian Tao

[permalink] [raw]
Subject: [PATCH] w1: ds2708 and ds2781 use the new API kobj_to_dev()

fix the below warnning:
/drivers/w1/slaves/w1_ds2780.c:93:60-61: WARNING opportunity for
kobj_to_dev()

Signed-off-by: Tian Tao <[email protected]>
---
drivers/w1/slaves/w1_ds2780.c | 3 ++-
drivers/w1/slaves/w1_ds2781.c | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c
index c281fe5..3cde1bb 100644
--- a/drivers/w1/slaves/w1_ds2780.c
+++ b/drivers/w1/slaves/w1_ds2780.c
@@ -90,7 +90,8 @@ static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t off, size_t count)
{
- struct device *dev = container_of(kobj, struct device, kobj);
+ struct device *dev = kobj_to_dev(kobj);
+
return w1_ds2780_io(dev, buf, off, count, 0);
}

diff --git a/drivers/w1/slaves/w1_ds2781.c b/drivers/w1/slaves/w1_ds2781.c
index f0d393a..2cb7c02 100644
--- a/drivers/w1/slaves/w1_ds2781.c
+++ b/drivers/w1/slaves/w1_ds2781.c
@@ -87,7 +87,7 @@ static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t off, size_t count)
{
- struct device *dev = container_of(kobj, struct device, kobj);
+ struct device *dev = kobj_to_dev(kobj);
return w1_ds2781_io(dev, buf, off, count, 0);
}

--
2.7.4


2021-03-01 13:12:29

by Greg KH

[permalink] [raw]
Subject: Re: [PATCH] w1: ds2708 and ds2781 use the new API kobj_to_dev()

On Mon, Mar 01, 2021 at 08:58:55PM +0800, Tian Tao wrote:
> fix the below warnning:
> /drivers/w1/slaves/w1_ds2780.c:93:60-61: WARNING opportunity for
> kobj_to_dev()

What creates that warning?

>
> Signed-off-by: Tian Tao <[email protected]>
> ---
> drivers/w1/slaves/w1_ds2780.c | 3 ++-
> drivers/w1/slaves/w1_ds2781.c | 2 +-
> 2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c
> index c281fe5..3cde1bb 100644
> --- a/drivers/w1/slaves/w1_ds2780.c
> +++ b/drivers/w1/slaves/w1_ds2780.c
> @@ -90,7 +90,8 @@ static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
> struct bin_attribute *bin_attr, char *buf,
> loff_t off, size_t count)
> {
> - struct device *dev = container_of(kobj, struct device, kobj);
> + struct device *dev = kobj_to_dev(kobj);
> +

Why the extra line here, but not in the other chunk?

Consistancy is key :)

Please fix up.

thanks,

greg k-h

2021-03-02 20:06:34

by Greg KH

[permalink] [raw]
Subject: Re: [PATCH] w1: ds2708 and ds2781 use the new API kobj_to_dev()

On Tue, Mar 02, 2021 at 02:17:02PM +0800, Tian Tao wrote:
> fix the below warnning which reported by coccicheck.
> /drivers/w1/slaves/w1_ds2780.c:93:60-61: WARNING opportunity for
> kobj_to_dev().
> /drivers/w1/slaves/w1_ds2781.c:90:60-61: WARNING opportunity for
> kobj_to_dev().
>
> Signed-off-by: Tian Tao <[email protected]>
> ---
> drivers/w1/slaves/w1_ds2780.c | 2 +-
> drivers/w1/slaves/w1_ds2781.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c
> index c281fe5..9dcb5a5 100644
> --- a/drivers/w1/slaves/w1_ds2780.c
> +++ b/drivers/w1/slaves/w1_ds2780.c
> @@ -90,7 +90,7 @@ static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
> struct bin_attribute *bin_attr, char *buf,
> loff_t off, size_t count)
> {
> - struct device *dev = container_of(kobj, struct device, kobj);
> + struct device *dev = kobj_to_dev(kobj);
> return w1_ds2780_io(dev, buf, off, count, 0);
> }
>
> diff --git a/drivers/w1/slaves/w1_ds2781.c b/drivers/w1/slaves/w1_ds2781.c
> index f0d393a..2cb7c02 100644
> --- a/drivers/w1/slaves/w1_ds2781.c
> +++ b/drivers/w1/slaves/w1_ds2781.c
> @@ -87,7 +87,7 @@ static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
> struct bin_attribute *bin_attr, char *buf,
> loff_t off, size_t count)
> {
> - struct device *dev = container_of(kobj, struct device, kobj);
> + struct device *dev = kobj_to_dev(kobj);
> return w1_ds2781_io(dev, buf, off, count, 0);
> }
>
> --
> 2.7.4
>

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
a patch that has triggered this response. He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created. Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.

You are receiving this message because of the following common error(s)
as indicated below:

- This looks like a new version of a previously submitted patch, but you
did not list below the --- line any changes from the previous version.
Please read the section entitled "The canonical patch format" in the
kernel file, Documentation/SubmittingPatches for what needs to be done
here to properly describe this.

If you wish to discuss this problem further, or you have questions about
how to resolve this issue, please feel free to respond to this email and
Greg will reply once he has dug out from the pending patches received
from other developers.

thanks,

greg k-h's patch email bot

2021-03-04 05:36:01

by tiantao (H)

[permalink] [raw]
Subject: Re: [PATCH] w1: ds2708 and ds2781 use the new API kobj_to_dev()

Hi:

在 2021/3/1 21:09, Greg KH 写道:
> On Mon, Mar 01, 2021 at 08:58:55PM +0800, Tian Tao wrote:
>> fix the below warnning:
>> /drivers/w1/slaves/w1_ds2780.c:93:60-61: WARNING opportunity for
>> kobj_to_dev()
> What creates that warning?
This is reported by coccicheck.
>
>
>> Signed-off-by: Tian Tao <[email protected]>
>> ---
>> drivers/w1/slaves/w1_ds2780.c | 3 ++-
>> drivers/w1/slaves/w1_ds2781.c | 2 +-
>> 2 files changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c
>> index c281fe5..3cde1bb 100644
>> --- a/drivers/w1/slaves/w1_ds2780.c
>> +++ b/drivers/w1/slaves/w1_ds2780.c
>> @@ -90,7 +90,8 @@ static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
>> struct bin_attribute *bin_attr, char *buf,
>> loff_t off, size_t count)
>> {
>> - struct device *dev = container_of(kobj, struct device, kobj);
>> + struct device *dev = kobj_to_dev(kobj);
>> +
> Why the extra line here, but not in the other chunk?

This is reported by checkpatch.

[email protected]:~/mailline/linux-next$ ./scripts/checkpatch.pl
drivers/w1/slaves/w1_ds2780.c

WARNING: Missing a blank line after declarations
#94: FILE: drivers/w1/slaves/w1_ds2780.c:94:
+       struct device *dev = kobj_to_dev(kobj);
+       return w1_ds2780_io(dev, buf, off, count, 0);

>
> Consistancy is key :)
>
> Please fix up.
>
> thanks,
>
> greg k-h
> .
>

2021-03-04 05:48:02

by Greg KH

[permalink] [raw]
Subject: Re: [PATCH] w1: ds2708 and ds2781 use the new API kobj_to_dev()

On Tue, Mar 02, 2021 at 08:51:08AM +0800, tiantao (H) wrote:
> Hi:
>
> 在 2021/3/1 21:09, Greg KH 写道:
> > On Mon, Mar 01, 2021 at 08:58:55PM +0800, Tian Tao wrote:
> > > fix the below warnning:
> > > /drivers/w1/slaves/w1_ds2780.c:93:60-61: WARNING opportunity for
> > > kobj_to_dev()
> > What creates that warning?
> This is reported by coccicheck.

Then include that in the changelog text, otherwise this looks like a
warning by the complier, which it is not.

> > > Signed-off-by: Tian Tao <[email protected]>
> > > ---
> > > drivers/w1/slaves/w1_ds2780.c | 3 ++-
> > > drivers/w1/slaves/w1_ds2781.c | 2 +-
> > > 2 files changed, 3 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c
> > > index c281fe5..3cde1bb 100644
> > > --- a/drivers/w1/slaves/w1_ds2780.c
> > > +++ b/drivers/w1/slaves/w1_ds2780.c
> > > @@ -90,7 +90,8 @@ static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
> > > struct bin_attribute *bin_attr, char *buf,
> > > loff_t off, size_t count)
> > > {
> > > - struct device *dev = container_of(kobj, struct device, kobj);
> > > + struct device *dev = kobj_to_dev(kobj);
> > > +
> > Why the extra line here, but not in the other chunk?
>
> This is reported by checkpatch.
>
> [email protected]:~/mailline/linux-next$ ./scripts/checkpatch.pl
> drivers/w1/slaves/w1_ds2780.c
>
> WARNING: Missing a blank line after declarations
> #94: FILE: drivers/w1/slaves/w1_ds2780.c:94:
> +       struct device *dev = kobj_to_dev(kobj);
> +       return w1_ds2780_io(dev, buf, off, count, 0);

Yes, but you made this change in only one of the hunks, and not the
other.

And, it is a different type of change, only do one "logical" thing per
patch. This should be a 2 patch series if you care about the coding
style of this driver.

Please fix up and resend.

thanks,

greg k-h