linux-kernel - Re: [PATCH 07/23] pci, dmar: Update dmar units devices list during hotplug

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Message-ID: <CAErSpo55k_pJP2X_9jp+oBGAT_1y9hS8QNs0SgomwR-NpvimNA@mail.gmail.com>
Date:	Fri, 9 Mar 2012 10:37:44 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>, x86 <x86@...nel.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 07/23] pci, dmar: Update dmar units devices list during hotplug

On Fri, Mar 9, 2012 at 10:32 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Fri, Mar 9, 2012 at 9:25 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>>
>> Well, it looks like you can change both save_dev_dmaru() *and*
>> get_dev_dmaru() to take a struct pci_dev *.  I assumed that would be
>> obvious.
>
> no.
>
> get_dev_dmaru() have to use bus/devfn to retrieve the dev pointer.

I expected something like that, but all I see in the patch is this:

+static void restore_dev_to_drhd(struct pci_dev *dev)
+       drhd = get_dev_dmaru(pci_domain_nr(dev->bus), dev->bus->number,
+                                dev->devfn, &i, &saved_dev_drhd_list);

+static void restore_dev_to_atsr(struct pci_dev *dev)
+       atsr = get_dev_dmaru(pci_domain_nr(dev->bus), dev->bus->number,
+                                dev->devfn, &i, &saved_dev_atsr_list);

In both those cases, you have the struct pci_dev *.
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