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

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Message-ID: <Z-VADhMDmmPFhlC5@debian-BULLSEYE-live-builder-AMD64>
Date: Thu, 27 Mar 2025 09:09:50 -0300
From: Marcelo Schmitt <marcelo.schmitt1@...il.com>
To: Angelo Dureghello <adureghello@...libre.com>
Cc: Nuno Sá <nuno.sa@...log.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Jonathan Corbet <corbet@....net>,
	Olivier Moysan <olivier.moysan@...s.st.com>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	linux-iio@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] iio: dac: ad3552r-hs: add support for internal ramp

On 03/27, Angelo Dureghello wrote:
> 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@...libre.com>
> > > 
...
> > > +
> > > +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.

Oh, okay. I was just more used to see '\0' as buffer/string terminator.
I see now buf[count] = 0; should work too.

> 
> > ?
> 
> Regards,
> angelo

Regards,
Marcelo