linux-kernel - Re: [PATCH v2 03/14] soundwire: Add Master registration

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Date:   Thu, 16 Nov 2017 17:30:24 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Vinod Koul <vinod.koul@...el.com>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        ALSA <alsa-devel@...a-project.org>, Takashi <tiwai@...e.de>,
        Pierre <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Shreyas NC <shreyas.nc@...el.com>, patches.audio@...el.com,
        alan@...ux.intel.com,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Sagar Dharia <sdharia@...eaurora.org>, plai@...eaurora.org,
        Sudheer Papothi <spapothi@...eaurora.org>
Subject: Re: [PATCH v2 03/14] soundwire: Add Master registration

On Thu, Nov 16, 2017 at 10:19:44PM +0530, Vinod Koul wrote:
> On Thu, Nov 16, 2017 at 04:05:22PM +0000, Srinivas Kandagatla wrote:

> > >+	*bus->assigned = ~GENMASK(SDW_BROADCAST_DEV_NUM, SDW_ENUM_DEV_NUM);

> > Can't we use ida for this.
> > This would also cut down code added for allocating dev_num.

> Device numbers in SoundWire are 0 thru 15 with 0 and 15 having special
> meaning so can'r be allocated. Bitmaps give me a nice way to ensure we dont
> use those by masking these and above 15... IDR uses bitmap with stuff on top
> which maynot be helpful here as I need a number 1 to 14. For a generic, give
> me a number IDRs are very useful.

Perhaps we need some comments or something explaining the constraints
here to stop people doing misguided cleanups?

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