linux-kernel - Re: [PATCH v5 04/15] soundwire: Add MIPI DisCo property helpers

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Date:   Mon, 11 Dec 2017 18:06:30 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Vinod Koul <vinod.koul@...el.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        ALSA <alsa-devel@...a-project.org>, Mark <broonie@...nel.org>,
        Pierre <pierre-louis.bossart@...ux.intel.com>,
        patches.audio@...el.com, alan@...ux.intel.com,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Sagar Dharia <sdharia@...eaurora.org>,
        srinivas.kandagatla@...aro.org, plai@...eaurora.org,
        Sudheer Papothi <spapothi@...eaurora.org>
Subject: Re: [PATCH v5 04/15] soundwire: Add MIPI DisCo property helpers

On Mon, 11 Dec 2017 18:00:22 +0100,
Vinod Koul wrote:
> 
> On Mon, Dec 11, 2017 at 05:10:17PM +0100, Takashi Iwai wrote:
> > On Wed, 06 Dec 2017 16:47:00 +0100,
> > Vinod Koul wrote:
> > > 
> > > +		/* TODO: Read audio mode */
> > > +
> > > +		i++;
> > > +	}
> > 
> > Don't we use count argument for a sanity check?
> 
> Not really as that iterator runs on each bit:
> 
> for_each_set_bit(bit, &addr, 32) {
> 
> so it will not go on endlessly and can max out when all the bits being set
> and stop.

Yes, that shouldn't happen.  OTOH, only looking at the callee side,
one may wonder that the possible error would be dpn[] overflows the
given array size (=count).  Though, looking at both caller and callee,
one realizes that it shouldn't happen, too.
(But then again wonders why passing count argument at all :)


Takashi