linux-kernel - Re: [PATCH v7 01/10] i3c: Add core I3C infrastructure

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Message-ID: <20180918090002.2e4012e6@bbrezillon>
Date:   Tue, 18 Sep 2018 09:00:02 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     vitor <Vitor.Soares@...opsys.com>
Cc:     Wolfram Sang <wsa@...-dreams.de>, <linux-i2c@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>, <linux-doc@...r.kernel.org>,
        Przemyslaw Sroka <psroka@...ence.com>,
        Arkadiusz Golec <agolec@...ence.com>,
        Alan Douglas <adouglas@...ence.com>,
        Bartosz Folta <bfolta@...ence.com>,
        Damian Kos <dkos@...ence.com>,
        "Alicja Jurasik-Urbaniak" <alicja@...ence.com>,
        Cyprian Wronka <cwronka@...ence.com>,
        Suresh Punnoose <sureshp@...ence.com>,
        "Rafal Ciepiela" <rafalc@...ence.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        "Kumar Gala" <galak@...eaurora.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Xiang Lin <Xiang.Lin@...aptics.com>,
        <linux-gpio@...r.kernel.org>, Sekhar Nori <nsekhar@...com>,
        Przemyslaw Gaj <pgaj@...ence.com>,
        Peter Rosin <peda@...ntia.se>,
        Mike Shettel <mshettel@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>
Subject: Re: [PATCH v7 01/10] i3c: Add core I3C infrastructure

Hi Vitor,

Sorry for the late reply, I was not at the office last week.

On Tue, 11 Sep 2018 11:04:07 +0100
vitor <Vitor.Soares@...opsys.com> wrote:

> Hi Boris,
> 
> On 05-09-2018 16:40, Boris Brezillon wrote:
> > +i3c_master_register_new_i3c_devs(struct i3c_master_controller *master)
> > +{
> > +	struct i3c_dev_desc *desc;
> > +	int ret;
> > +
> > +	if (!master->init_done)
> > +		return;
> > +  
> If you have a hot-join and call i3c_master_do_daa this function will 
> return without create the i3c_device.

Hm, you mean if hot-join happens when the I3C master is not yet
registered? That shouldn't be a problem since all devices will be
registered at the end of i3c_master_register(). Am I missing something?
Is this a problem you actually face or just something you found out
doing code inspection?

> 
> > +	i3c_bus_for_each_i3cdev(master->bus, desc) {
> > +		if (desc->dev || !desc->info.dyn_addr || desc == master->this)
> > +			continue;
> > +
> > +		desc->dev = kzalloc(sizeof(*desc->dev), GFP_KERNEL);
> > +		if (!desc->dev)
> > +			continue;
> > +
> > +		desc->dev->bus = master->bus;
> > +		desc->dev->desc = desc;
> > +		desc->dev->dev.parent = &master->bus->dev;
> > +		desc->dev->dev.type = &i3c_device_type;
> > +		desc->dev->dev.bus = &i3c_bus_type;
> > +		desc->dev->dev.release = i3c_device_release;
> > +		dev_set_name(&desc->dev->dev, "%d-%llx", master->bus->id,
> > +			     desc->info.pid);
> > +
> > +		if (desc->boardinfo)
> > +			desc->dev->dev.of_node = desc->boardinfo->of_node;
> > +
> > +		ret = device_register(&desc->dev->dev);
> > +		if (ret)
> > +			dev_err(master->parent,
> > +				"Failed to add I3C device (err = %d)\n", ret);
> > +	}
> > +}

Regards,

Boris