Re: [PATCH v2 1/4] MicroSemi Switchtec management interface driver

From: Logan Gunthorpe
Date: Fri Feb 10 2017 - 11:52:14 EST

Hey Greg,

Thanks so much for the review.

On 10/02/17 07:51 AM, Greg Kroah-Hartman wrote:
> On Thu, Feb 02, 2017 at 11:06:00AM -0700, Logan Gunthorpe wrote:
>> + cdev = &stdev->cdev;
>> + cdev_init(cdev, &switchtec_fops);
>> + cdev->owner = THIS_MODULE;
>> + cdev->kobj.parent = &dev->kobj;
> Minor nit, the kobject in a cdev is unlike any other kobject you have
> ever seen, don't mess with it, it's not doing anything like you think it
> is doing. So no need to set the parent field.

Ok, that makes sense. I'll do a v3 shortly.

I copied this from drivers/dax/dax.c so when I have a spare moment I'll
submit a patch to remove it from there as well.

Just to make sure I get this right without extra churn: does this look

cdev = &stdev->cdev;
cdev_init(cdev, &switchtec_fops);
cdev->owner = THIS_MODULE;

rc = cdev_add(&stdev->cdev, dev->devt, 1);
if (rc)
goto err_cdev;

dev = &stdev->dev;
dev->devt = MKDEV(MAJOR(switchtec_devt), minor);
dev->class = switchtec_class;
dev->parent = &pdev->dev;
dev->groups = switchtec_device_groups;
dev->release = stdev_release;
dev_set_name(dev, "switchtec%d", minor);

rc = device_register(dev);
if (rc) {
return ERR_PTR(rc);