linux-kernel - Re: [PATCH] SCSI driver for VMware's virtual HBA.

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Message-Id: <200908312051.26264.eike-kernel@sf-tec.de>
Date:	Mon, 31 Aug 2009 20:51:18 +0200
From:	Rolf Eike Beer <eike-kernel@...tec.de>
To:	akataria@...are.com
Cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	Robert Love <robert.w.love@...el.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Mike Christie <michaelc@...wisc.edu>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Torokhov <dtor@...are.com>,
	Maxime Austruy <maustruy@...are.com>
Subject: Re: [PATCH] SCSI driver for VMware's virtual HBA.

Alok Kataria wrote:
> Hi Eike,

> > > +static int __devinit pvscsi_probe(struct pci_dev *pdev,
> > > +				  const struct pci_device_id *id)
> > > +{
> > > +	struct pvscsi_adapter *adapter;
> > > +	struct Scsi_Host *host;
> > > +	unsigned long base, i;
> > > +	int error;
> > > +
> > > +	error = -ENODEV;
> > > +
> > > +	if (pci_enable_device(pdev))
> > > +		return error;
> >
> > As always I suggest having a look on devres (see Documentation/driver-
> > model/devres.txt) which could simplify your error handling here and your
> > release function a lot. You only need to make sure it doesn't hurt if all
> > the PCI resources are freed after the scsi ones as you would end up
> > cleaning the scsi ones by hand and afterwards devres would throw all it
> > handles (which will probably be most of your PCI stuff) away itself.
>
> I took a quick look, but would prefer not to change this right now. Will
> do this as a incremental change later. Hope that is fine.

Just a suggestion ;)

> > > +	adapter->dev  = pdev;
> > > +	adapter->host = host;
> > > +
> > > +	spin_lock_init(&adapter->hw_lock);
> > > +
> > > +	host->max_channel = 0;
> > > +	host->max_id      = 16;
> > > +	host->max_lun     = 1;
> > > +
> > > +	pci_read_config_byte(pdev, PCI_CLASS_REVISION, &adapter->rev);
> >
> > That's in pdev->revision anyway, isn't it?
>
> Yep, though, its needed in pvscsi_info, so will keep this in adapter
> too.

Yes, but you don't need to do pci_read_config_byte() but simply copying that 
over from pdev->revision.

Eike

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