linux-kernel - Re: [PATCH v6 01/10] i3c: Add core I3C infrastructure

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Date:   Sat, 4 Aug 2018 07:33:58 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     <mshettel@...eaurora.org>
Cc:     "'Wolfram Sang'" <wsa@...-dreams.de>, <linux-i2c@...r.kernel.org>,
        "'Jonathan Corbet'" <corbet@....net>, <linux-doc@...r.kernel.org>,
        "'Greg Kroah-Hartman'" <gregkh@...uxfoundation.org>,
        "'Arnd Bergmann'" <arnd@...db.de>,
        "'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>,
        "'Vitor Soares'" <Vitor.Soares@...opsys.com>,
        "'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>
Subject: Re: [PATCH v6 01/10] i3c: Add core I3C infrastructure

Hi Mike,

On Fri, 3 Aug 2018 15:38:43 -0600
<mshettel@...eaurora.org> wrote:

> > +static void
> > +i3c_master_register_new_i3c_devs(struct i3c_master_controller *master)
> > +{
> > +	struct i3c_dev_desc *desc;
> > +	int ret;
> > +
> > +	if (!master->init_done)
> > +		return;
> > +
> > +	i3c_bus_for_each_i3cdev(master->bus, desc) {
> > +		if (desc->dev || !desc->info.dyn_addr)
> > +			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;
> > +		if (desc == master->this)
> > +			desc->dev->dev.type = &i3c_master_type;
> > +		else
> > +			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;  
> > +
> > +		pr_info("%s:%i\n", __func__, __LINE__);
> > +		if (ret)
> > +			dev_err(master->parent,
> > +				"Failed to add I3C device (err = %d)\n",  
> ret);
> > +	}
> > +}  
> 
> The compiler gives a warning that "ret" may be used uninitialized in the
> above function, which is true since "ret" is never assigned a value.  Also,
> I wonder about the "pr_info" call here, should there be a more detailed
> message here about the device being registered, other than the file name and
> line number?

Yes, kbuild already reported that problem. I messed up when selecting
the lines to add to my commit and added this trace instead of

		ret = device_register(&desc->dev->dev);

Will be fixed in v7.

> 
> Otherwise, I have gone through the code in the process of writing the first
> iteration of the Qualcomm I3C master driver, and overall the framework looks
> good.  Will update with any additional feedback I have.

Thanks for looking at the framework code. Your driver is in my TODO
list.

Regards,

Boris