netdev - RE: [net-next v2 1/9] Implementation of Virtual Bus

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Message-ID: <DM6PR11MB28417AFF32355A39994D76CADDD50@DM6PR11MB2841.namprd11.prod.outlook.com>
Date:   Tue, 21 Apr 2020 23:27:13 +0000
From:   "Ertman, David M" <david.m.ertman@...el.com>
To:     Jason Gunthorpe <jgg@...pe.ca>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "sassmann@...hat.com" <sassmann@...hat.com>,
        "parav@...lanox.com" <parav@...lanox.com>,
        "galpress@...zon.com" <galpress@...zon.com>,
        "selvin.xavier@...adcom.com" <selvin.xavier@...adcom.com>,
        "sriharsha.basavapatna@...adcom.com" 
        <sriharsha.basavapatna@...adcom.com>,
        "benve@...co.com" <benve@...co.com>,
        "bharat@...lsio.com" <bharat@...lsio.com>,
        "xavier.huwei@...wei.com" <xavier.huwei@...wei.com>,
        "yishaih@...lanox.com" <yishaih@...lanox.com>,
        "leonro@...lanox.com" <leonro@...lanox.com>,
        "mkalderon@...vell.com" <mkalderon@...vell.com>,
        "aditr@...are.com" <aditr@...are.com>,
        "ranjani.sridharan@...ux.intel.com" 
        <ranjani.sridharan@...ux.intel.com>,
        "pierre-louis.bossart@...ux.intel.com" 
        <pierre-louis.bossart@...ux.intel.com>,
        "Patil, Kiran" <kiran.patil@...el.com>,
        "Bowers, AndrewX" <andrewx.bowers@...el.com>
Subject: RE: [net-next v2 1/9] Implementation of Virtual Bus

> -----Original Message-----
> From: Jason Gunthorpe <jgg@...pe.ca>
> Sent: Tuesday, April 21, 2020 5:09 AM
> To: Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>
> Cc: davem@...emloft.net; gregkh@...uxfoundation.org; Ertman, David M
> <david.m.ertman@...el.com>; netdev@...r.kernel.org; linux-
> rdma@...r.kernel.org; nhorman@...hat.com; sassmann@...hat.com;
> parav@...lanox.com; galpress@...zon.com;
> selvin.xavier@...adcom.com; sriharsha.basavapatna@...adcom.com;
> benve@...co.com; bharat@...lsio.com; xavier.huwei@...wei.com;
> yishaih@...lanox.com; leonro@...lanox.com; mkalderon@...vell.com;
> aditr@...are.com; ranjani.sridharan@...ux.intel.com; pierre-
> louis.bossart@...ux.intel.com; Patil, Kiran <kiran.patil@...el.com>; Bowers,
> AndrewX <andrewx.bowers@...el.com>
> Subject: Re: [net-next v2 1/9] Implementation of Virtual Bus
> 
> On Tue, Apr 21, 2020 at 01:02:27AM -0700, Jeff Kirsher wrote:
> > +/**
> > + * virtbus_release_device - Destroy a virtbus device
> > + * @_dev: device to release
> > + */
> > +static void virtbus_release_device(struct device *_dev)
> > +{
> > +	struct virtbus_device *vdev = to_virtbus_dev(_dev);
> > +	int ida = vdev->id;
> > +
> > +	vdev->release(vdev);
> > +	ida_simple_remove(&virtbus_dev_ida, ida);
> > +}
> > +
> > +/**
> > + * virtbus_register_device - add a virtual bus device
> > + * @vdev: virtual bus device to add
> > + */
> > +int virtbus_register_device(struct virtbus_device *vdev)
> > +{
> > +	int ret;
> > +
> > +	if (!vdev->release) {
> > +		dev_err(&vdev->dev, "virtbus_device MUST have a .release
> callback that does something.\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	/* Don't return on error here before the device_initialize.
> > +	 * All error paths out of this function must perform a
> > +	 * put_device(), unless the release callback does not exist,
> > +	 * so that the .release() callback is called, and thus have
> > +	 * to occur after the device_initialize.
> > +	 */
> > +	device_initialize(&vdev->dev);
> > +
> > +	vdev->dev.bus = &virtual_bus_type;
> > +	vdev->dev.release = virtbus_release_device;
> > +
> > +	/* All device IDs are automatically allocated */
> > +	ret = ida_simple_get(&virtbus_dev_ida, 0, 0, GFP_KERNEL);
> > +
> > +	if (ret < 0) {
> > +		dev_err(&vdev->dev, "get IDA idx for virtbus device
> failed!\n");
> > +		goto device_pre_err;
> 
> This still has the problem I described, why are you resending without
> fixing?
> 
> Jason

Fix should be in the next revision - sorry for the confusion.

-DaveE