Re: [PATCH 4/4] iio: dac: ad3552r-hs: add support for internal ramp

[Angelo Dureghello]

On 26.03.2025 18:52, Marcelo Schmitt wrote:
> Hello Angelo,
> 
> Patch looks good to me.
> One minor comment bellow.
> 
> On 03/21, Angelo Dureghello wrote:
> > From: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
> > 
> > The ad3552r can be feeded from the HDL controller by an internally
> > generated 16bit ramp, useful for debug pourposes. Add debugfs a file
> > to enable or disable it.
> > 
> > Signed-off-by: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
> > ---
> >  drivers/iio/dac/ad3552r-hs.c | 106 ++++++++++++++++++++++++++++++++++++++++---
> >  1 file changed, 100 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/iio/dac/ad3552r-hs.c b/drivers/iio/dac/ad3552r-hs.c
> > index 37397e188f225a8099745ec03f7c604da76960b1..41fe78d982a68980db059b095fc27b37ea1a461b 100644
> > --- a/drivers/iio/dac/ad3552r-hs.c
> > +++ b/drivers/iio/dac/ad3552r-hs.c
> > @@ -7,6 +7,7 @@
> ...
> > +
> > +static ssize_t ad3552r_hs_write_data_source(struct file *f,
> > +					    const char __user *userbuf,
> > +					    size_t count, loff_t *ppos)
> > +{
> > +	struct ad3552r_hs_state *st = file_inode(f)->i_private;
> > +	char buf[64];
> > +	int ret;
> > +
> > +	ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf,
> > +				     count);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	buf[count] = 0;
> Shouldn't it be
> 	buf[count] = '\0';

Why ? I am zero-terminating the string properly.

> ?

Regards,
angelo