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

[Boris Brezillon]

Hi Mike,

On Fri, 3 Aug 2018 15:38:43 -0600
<mshettel@xxxxxxxxxxxxxx> 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