linux-kernel - Re: [PATCH 4.19 62/86] ASoC: intel: skl: Fix pin debug prints

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Message-ID: <20200311095329.GA16792@duo.ucw.cz>
Date:   Wed, 11 Mar 2020 10:53:29 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Pavel Machek <pavel@...x.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Takashi Iwai <tiwai@...e.de>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH 4.19 62/86] ASoC: intel: skl: Fix pin debug prints

On Wed 2020-03-11 10:52:11, Pavel Machek wrote:
> Hi!
> 
> > From: Takashi Iwai <tiwai@...e.de>
> > 
> > commit 64bbacc5f08c01954890981c63de744df1f29a30 upstream.
> > 
> > skl_print_pins() loops over all given pins but it overwrites the text
> > at the very same position while increasing the returned length.
> > Fix this to show the all pin contents properly.
> 
> > --- a/sound/soc/intel/skylake/skl-debug.c
> > +++ b/sound/soc/intel/skylake/skl-debug.c
> > @@ -42,7 +42,7 @@ static ssize_t skl_print_pins(struct skl
> >  	int i;
> >  	ssize_t ret = 0;
> >  
> > -	for (i = 0; i < max_pin; i++)
> > +	for (i = 0; i < max_pin; i++) {
> >  		ret += snprintf(buf + size, MOD_BUF - size,
> >  				"%s %d\n\tModule %d\n\tInstance %d\n\t"
> >  				"In-used %s\n\tType %s\n"
> > @@ -53,6 +53,8 @@ static ssize_t skl_print_pins(struct skl
> >  				m_pin[i].in_use ? "Used" : "Unused",
> >  				m_pin[i].is_dynamic ? "Dynamic" : "Static",
> >  				m_pin[i].pin_state, i);
> > +		size += ret;
> > +	}
> >  	return ret;
> 
> This may be an improvement, but I believe this should use
> "scnprintf()" as snprintf can return values bigger than size passed
> in.

Aha, and it indeed does that, just in the separate patch.

Sorry for the noise,
								Pavel
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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