linux-kernel - RE: [PATCH 3/5] drivers/infiniband: correct size computation

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Date:	Mon, 7 Dec 2009 17:42:07 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	"Tung, Chien Tin" <chien.tin.tung@...el.com>
Cc:	"Latif, Faisal" <faisal.latif@...el.com>,
	Roland Dreier <rolandd@...co.com>,
	"Hefty, Sean" <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: RE: [PATCH 3/5] drivers/infiniband: correct size computation

On Mon, 7 Dec 2009, Tung, Chien Tin wrote:

> >> > 	/* Remap the PCI registers in adapter BAR0 to kernel VA space */
> >> >-	mmio_regs = ioremap_nocache(pci_resource_start(pcidev, BAR_0), sizeof(mmio_regs));
> >> >+	mmio_regs = ioremap_nocache(pci_resource_start(pcidev, BAR_0),
> >> >+				    sizeof(*mmio_regs));
> >> > 	if (mmio_regs == NULL) {
> >> > 		printk(KERN_ERR PFX "Unable to remap BAR0\n");
> >> > 		ret = -EIO;
> >>
> >> mmio_regs is initialized to NULL at the top of the function so
> >> *mmio_regs wouldn't be a good idea.  Instead of sizeof(*mmio_regs) use
> >> pci_resource_len(pcidev, BAR_0).  If you can recreate the patch with
> >> this change I will ack it.
> >
> >When you say that it isn't a good idea, do you mean that the result is
> >wrong, or that it looks odd?  I didn't think sizeof looked at the value,
> >but only at the type?
> 
> 
> I misspoke on the problem.  Mmio_regs is declared as a void pointer:
> 
>         void __iomem *mmio_regs = NULL;
> 
> Thus pci_resource_len(pcidev, BAR_0) is the correct fix.

OK, thanks for the clarification.  I will make another patch later today.

julia
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