lkml.org 
[lkml]   [2012]   [Sep]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] PCI, x86: clear initial value for root info resources
On Tue, Sep 18, 2012 at 5:49 PM, Yinghai Lu <yinghai@kernel.org> wrote:
> On Tue, Sep 18, 2012 at 3:46 PM, Bjorn Helgaas <bhelgaas@google.com> wrote:
>> On Fri, Sep 14, 2012 at 6:48 PM, Yinghai Lu <yinghai@kernel.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.

Why should we wait to fix that bug until later? I'm not interested in
debugging this in the future. If you fix a bug, you should always try
to fix other occurrences of the same bug at the same time.


\
 
 \ /
  Last update: 2012-09-19 16:01    [W:0.089 / U:0.308 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site