linux-kernel - Re: [Pcihpd-discuss] [PATCH 2/5] Construct one fakephp slot per pci slot

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Message-ID: <20071114141755.GA7523@ldl.fc.hp.com>
Date:	Wed, 14 Nov 2007 07:17:55 -0700
From:	Alex Chiang <achiang@...com>
To:	Rolf Eike Beer <eike-hotplug@...tec.de>
Cc:	pcihpd-discuss@...ts.sourceforge.net, gregkh@...e.de,
	kristen.c.accardi@...el.com, lenb@...nel.org, matthew@....cx,
	rick.jones2@...com, linux-kernel@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz, linux-acpi@...r.kernel.org
Subject: Re: [Pcihpd-discuss] [PATCH 2/5] Construct one fakephp slot per
	pci slot

Hi Eike,

* Rolf Eike Beer <eike-hotplug@...tec.de>:
> Alex Chiang wrote:
> > --- a/drivers/pci/hotplug/fakephp.c
> > +++ b/drivers/pci/hotplug/fakephp.c
> > @@ -93,6 +93,7 @@ static int add_slot(struct pci_dev *dev)
> >  	struct dummy_slot *dslot;
> >  	struct hotplug_slot *slot;
> >  	int retval = -ENOMEM;
> > +	static int count = 1;
> >
> >  	slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
> >  	if (!slot)
> > @@ -106,7 +107,8 @@ static int add_slot(struct pci_dev *dev)
> >  	slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
> >  	slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;
> >
> > -	slot->name = &dev->dev.bus_id[0];
> > +	slot->name = kmalloc(8, GFP_KERNEL);
> > +	sprintf(slot->name, "fake%d", count++);
> >  	dbg("slot->name = %s\n", slot->name);
> >
> >  	dslot = kmalloc(sizeof(struct dummy_slot), GFP_KERNEL);
> 
> This is ugly. Please do it the way we already do e.g. for
> acpiphp: add a char[8] to "struct dummy_slot" and just
> reference that here.

I took at look at the code in acpiphp you're talking about, and
I'm not sure why you think the above is "ugly". We're talking
about a runtime vs compile time storage for the name, and doing a
kmalloc/sprintf is a pretty standard idiom.

BTW, I did incorporate both Linas' and Willy's comments, by
changing the kmalloc size to an explicit 32, and using snprintf
instead.

In any case, for your particular comment, I think I'm going to
leave it alone for now, and let Greg weigh in with the final
recommendation.

Thanks for the review.

/ac

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