linux-kernel - Re: [PATCH] PCI, x86: clear initial value for root info resources

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Date:	Tue, 18 Sep 2012 16:49:49 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	x86@...nel.org, Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH] PCI, x86: clear initial value for root info resources

On Tue, Sep 18, 2012 at 3:46 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Fri, Sep 14, 2012 at 6:48 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>> Found one system one root bus hot remove get panic.
>> Panic happens when try to release hostbridge resource.
>>
>> It turns out that resource get reject during put into resource tree
>> because of conflicts.
>> Also that resource parent pointer have random value.
>>
>> That invalid value cause it pass through check __release_pci_root_info
>> and panic in release_resource.
>>
>> Try to use kzalloc instead.
>
> Don't we need the same fix for ia64 in pci_acpi_scan_root()?  Here's
> what it does:
>
>         if (windows) {
>                 controller->window =
>                         kmalloc_node(sizeof(*controller->window) * windows,
>                                      GFP_KERNEL, controller->node);
>


yes, but they don't support pci_set_host_bridge_release yet. so they
should not meet this problem yet.

Thanks

Yinghai
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