The patch titled
fix "PCI: assign ioapic resource at hotplug"
has been added to the -mm tree. Its filename is
fix-pci-assign-ioapic-resource-at-hotplug.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: fix "PCI: assign ioapic resource at hotplug"
From: Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx>
Roland Dreier wrote:
> The change "PCI: assign ioapic resource at hotplug" (commit
> 23186279658cea6d42a050400d3e79c56cb459b4 in Linus's tree) makes
> networking stop working on my system (SuperMicro H8QC8 with four
> dual-core Opteron 885 CPUs). In particular, the on-board NIC stops
> working, probably because it gets assigned the wrong IRQ (225 in the
> non-working case, 217 in the working case)
>
> With that patch applied, e1000 doesn't work. Reverting just that
> patch (shown below) from Linus's latest tree fixes things for me.
>
The cause of this problem might be an wrong assumption that the 'start'
member of resource structure for ioapic device has non-zero value if the
resources are assigned by firmware. The 'start' member of ioapic device
seems not to be set even though the resources were actually assigned to
ioapic devices by firmware.
Cc: Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx>
Cc: MUNEDA Takahiro <muneda.takahiro@xxxxxxxxxxxxxx>
Cc: Satoru Takeuchi <takeuchi_satoru@xxxxxxxxxxxxxx>
Cc: Kristen Carlson Accardi <kristen.c.accardi@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxx>
Cc: Roland Dreier <rdreier@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/pci/setup-bus.c | 10 +++++-----
1 files changed, 5 insertions(+), 5 deletions(-)
diff -puN drivers/pci/setup-bus.c~fix-pci-assign-ioapic-resource-at-hotplug drivers/pci/setup-bus.c
--- a/drivers/pci/setup-bus.c~fix-pci-assign-ioapic-resource-at-hotplug
+++ a/drivers/pci/setup-bus.c
@@ -55,16 +55,16 @@ pbus_assign_resources_sorted(struct pci_
list_for_each_entry(dev, &bus->devices, bus_list) {
u16 class = dev->class >> 8;
- /* Don't touch classless devices or host bridges. */
+ /* Don't touch classless devices or host bridges or ioapics. */
if (class == PCI_CLASS_NOT_DEFINED ||
class == PCI_CLASS_BRIDGE_HOST)
continue;
- /* Don't touch ioapics if it has the assigned resources. */
+ /* Don't touch ioapic devices already enabled by firmware */
if (class == PCI_CLASS_SYSTEM_PIC) {
- res = &dev->resource[0];
- if (res[0].start || res[1].start || res[2].start ||
- res[3].start || res[4].start || res[5].start)
+ u16 command;
+ pci_read_config_word(dev, PCI_COMMAND, &command);
+ if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
continue;
}
_
Patches currently in -mm which might be from kaneshige.kenji@xxxxxxxxxxxxxx are
origin.patch
fix-pci-assign-ioapic-resource-at-hotplug.patch
-
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