[PATCH] iio: bma180: Convert to use sysfs_emit_at() API

[PATCH] iio: bma180: Convert to use sysfs_emit_at() API

[ye.xingchen]

From: ye xingchen <ye.xingchen@zte.com.cn>

Follow the advice of the Documentation/filesystems/sysfs.rst and show()
should only use sysfs_emit() or sysfs_emit_at() when formatting the
value to be returned to user space.

Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
---
 drivers/iio/accel/bma180.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c
index eb697eeb4301..9e3e5dfdded7 100644
--- a/drivers/iio/accel/bma180.c
+++ b/drivers/iio/accel/bma180.c
@@ -488,8 +488,7 @@ static ssize_t bma180_show_avail(char *buf, const int *vals, unsigned int n,
 	for (i = 0; i < n; i++) {
 		if (!vals[i])
 			continue;
-		len += scnprintf(buf + len, PAGE_SIZE - len,
-			micros ? "0.%06d " : "%d ", vals[i]);
+		len += sysfs_emit_at(buf, len, micros ? "0.%06d " : "%d ", vals[i]);
 	}
 	buf[len - 1] = '\n';

-- 
2.25.1

Re: [PATCH] iio: bma180: Convert to use sysfs_emit_at() API

[Dmitry Rokosov]

On Wed, Dec 07, 2022 at 10:03:19AM +0800, ye.xingchen@zte.com.cn wrote:
> From: ye xingchen <ye.xingchen@zte.com.cn>
> 
> Follow the advice of the Documentation/filesystems/sysfs.rst and show()
> should only use sysfs_emit() or sysfs_emit_at() when formatting the
> value to be returned to user space.
> 
> Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>

I think it would be better, if you provide one cover letter as 0/3 patch
and three nested real patches to each iio/accel driver which you want to
rework: adxl372, bma180, mma8452. Or fix all iio drivers (no only accel)
and send all of these changes as nested patches for one cover letter.

Please refer to https://www.kernel.org/doc/html/latest/process/submitting-patches.html

and use the following commands to generate such patches hierarchy:

$ git format-patch --cover-letter -o patches ...
$ git send-email \     
      --annotate \               
      --to="john.doe@kernel.org" \               
      --cc="linux-iio@vger.kernel.org" \
      --cc="linux-kernel@vger.kernel.org" \
      --smtp-debug 1 \                  
      patches/*

> ---
>  drivers/iio/accel/bma180.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c
> index eb697eeb4301..9e3e5dfdded7 100644
> --- a/drivers/iio/accel/bma180.c
> +++ b/drivers/iio/accel/bma180.c
> @@ -488,8 +488,7 @@ static ssize_t bma180_show_avail(char *buf, const int *vals, unsigned int n,
>  	for (i = 0; i < n; i++) {
>  		if (!vals[i])
>  			continue;
> -		len += scnprintf(buf + len, PAGE_SIZE - len,
> -			micros ? "0.%06d " : "%d ", vals[i]);
> +		len += sysfs_emit_at(buf, len, micros ? "0.%06d " : "%d ", vals[i]);
>  	}
>  	buf[len - 1] = '\n';
> 
> -- 
> 2.25.1

-- 
Thank you,
Dmitry

Re: [PATCH] iio: bma180: Convert to use sysfs_emit_at() API

[Jonathan Cameron]

On Wed, 7 Dec 2022 12:56:14 +0300
Dmitry Rokosov <ddrokosov@sberdevices.ru> wrote:

> On Wed, Dec 07, 2022 at 10:03:19AM +0800, ye.xingchen@zte.com.cn wrote:
> > From: ye xingchen <ye.xingchen@zte.com.cn>
> > 
> > Follow the advice of the Documentation/filesystems/sysfs.rst and show()
> > should only use sysfs_emit() or sysfs_emit_at() when formatting the
> > value to be returned to user space.
> > 
> > Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>  
> 
> I think it would be better, if you provide one cover letter as 0/3 patch
> and three nested real patches to each iio/accel driver which you want to
> rework: adxl372, bma180, mma8452. Or fix all iio drivers (no only accel)
> and send all of these changes as nested patches for one cover letter.
> 
> Please refer to https://www.kernel.org/doc/html/latest/process/submitting-patches.html
> 
> and use the following commands to generate such patches hierarchy:
> 
> $ git format-patch --cover-letter -o patches ...
> $ git send-email \     
>       --annotate \               
>       --to="john.doe@kernel.org" \               
>       --cc="linux-iio@vger.kernel.org" \
>       --cc="linux-kernel@vger.kernel.org" \
>       --smtp-debug 1 \                  
>       patches/*

Second this comment - also mark it at least v3 as some of these
patches will be on their 3rd version.

One major advantage of such a series is that a reply to the cover letter
can be used to indicate that someone is giving a tag for all the patches
underneath it.  Right now they'd have to reply to every single email.

So please send a v3 with all the similar IIO patches under a single cover
letter.  Make sure to gather tags from earlier versions.

Thanks,

Jonathan

> 
> > ---
> >  drivers/iio/accel/bma180.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c
> > index eb697eeb4301..9e3e5dfdded7 100644
> > --- a/drivers/iio/accel/bma180.c
> > +++ b/drivers/iio/accel/bma180.c
> > @@ -488,8 +488,7 @@ static ssize_t bma180_show_avail(char *buf, const int *vals, unsigned int n,
> >  	for (i = 0; i < n; i++) {
> >  		if (!vals[i])
> >  			continue;
> > -		len += scnprintf(buf + len, PAGE_SIZE - len,
> > -			micros ? "0.%06d " : "%d ", vals[i]);
> > +		len += sysfs_emit_at(buf, len, micros ? "0.%06d " : "%d ", vals[i]);
> >  	}
> >  	buf[len - 1] = '\n';
> > 
> > -- 
> > 2.25.1  
>