linux-kernel - Re: [RFC 1/1] MicroSemi Switchtec management interface driver

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Date:   Mon, 19 Dec 2016 07:35:15 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Jonathan Corbet <corbet@....net>,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Stephen Bates <stephen.bates@...rosemi.com>,
        linux-pci@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 1/1] MicroSemi Switchtec management interface driver

On Sun, Dec 18, 2016 at 10:20:47AM -0700, Logan Gunthorpe wrote:
> Hi Greg,
> 
> Thanks for the quick review!
> 
> On 18/12/16 12:51 AM, Greg Kroah-Hartman wrote:
> > On Sat, Dec 17, 2016 at 10:09:22AM -0700, Logan Gunthorpe wrote:
> > > +struct switchtec_dev {
> > > +	struct pci_dev *pdev;
> > > +	struct msix_entry *msix;
> > > +	struct device *dev;
> > > +	struct kref kref;
> > 
> > Why do you have a pointer to a device, yet a kref as well?  Just have
> > this structure embed a 'struct device' in itself, like you did for a
> > kref, and you will be fine.  Otherwise you are dealing with two
> > different sets of reference counting here, for no good reason.
> 
> Ok, understood. I had referenced the device dax driver which did it this way
> in 4.8 but looks like it was changed to the way you suggest in 4.9.
> 
> > > +#define stdev_pdev(stdev) ((stdev)->pdev)
> > > +#define stdev_pdev_dev(stdev) (&stdev_pdev(stdev)->dev)
> > > +#define stdev_name(stdev) pci_name(stdev_pdev(stdev))
> > > +#define stdev_dev(stdev) ((stdev)->dev)
> > 
> > Ick, just open code these please.  That's a huge hint your use of the
> > driver model is not correct :)
> 
> Ok, will do. For reference, I was copying
> 
> drivers/ntb/hw/intel/ntb_hw_intel.h
> 
> which does a similar thing.

No need to copy bad code, I suggest fixing that up as well :)

thanks,

greg k-h