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

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Message-ID: <20200311095211.GA16104@duo.ucw.cz>
Date:   Wed, 11 Mar 2020 10:52:11 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     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

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.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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