* [PATCH] x86/ioapic: Ignore root bridges without a companion ACPI device
@ 2016-09-10 15:40 Rui Wang
2016-09-10 17:27 ` Borislav Petkov
2016-09-12 21:25 ` Jon Derrick
0 siblings, 2 replies; 5+ messages in thread
From: Rui Wang @ 2016-09-10 15:40 UTC (permalink / raw)
To: bhelgaas, tglx, rjw, mingo, bp
Cc: torvalds, peterz, helgaas, linux-acpi, linux-pci, tony.luck, x86,
linux-kernel, rui.y.wang
Some PCI root bridges don't have a corresponding ACPI device.
This can be the case on some old platforms. Don't call acpi_ioapic_add()
on these bridges because they can't support ioapic hotplug.
v2: Per Boris's review, removed the unnecessary local var; refined comment
Signed-off-by: Rui Wang <rui.y.wang@intel.com>
Reviewed-by: Borislav Petkov <bp@alien8.de>
---
drivers/pci/setup-bus.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index ec538d3..8b4e231 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1855,7 +1855,10 @@ void __init pci_assign_unassigned_resources(void)
list_for_each_entry(root_bus, &pci_root_buses, node) {
pci_assign_unassigned_root_bus_resources(root_bus);
- acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
+
+ /* make sure the root bridge has a companion ACPI device */
+ if (ACPI_HANDLE(root_bus->bridge))
+ acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
}
}
--
1.8.3.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] x86/ioapic: Ignore root bridges without a companion ACPI device
2016-09-10 15:40 [PATCH] x86/ioapic: Ignore root bridges without a companion ACPI device Rui Wang
@ 2016-09-10 17:27 ` Borislav Petkov
2016-09-12 21:25 ` Jon Derrick
1 sibling, 0 replies; 5+ messages in thread
From: Borislav Petkov @ 2016-09-10 17:27 UTC (permalink / raw)
To: Rui Wang
Cc: bhelgaas, tglx, rjw, mingo, torvalds, peterz, helgaas, linux-acpi,
linux-pci, tony.luck, x86, linux-kernel
On Sat, Sep 10, 2016 at 11:40:45PM +0800, Rui Wang wrote:
> Some PCI root bridges don't have a corresponding ACPI device.
> This can be the case on some old platforms. Don't call acpi_ioapic_add()
> on these bridges because they can't support ioapic hotplug.
>
> v2: Per Boris's review, removed the unnecessary local var; refined comment
>
> Signed-off-by: Rui Wang <rui.y.wang@intel.com>
> Reviewed-by: Borislav Petkov <bp@alien8.de>
>
> ---
> drivers/pci/setup-bus.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index ec538d3..8b4e231 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -1855,7 +1855,10 @@ void __init pci_assign_unassigned_resources(void)
>
> list_for_each_entry(root_bus, &pci_root_buses, node) {
> pci_assign_unassigned_root_bus_resources(root_bus);
> - acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
> +
> + /* make sure the root bridge has a companion ACPI device */
> + if (ACPI_HANDLE(root_bus->bridge))
> + acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
Reported-and-tested-by: Borislav Petkov <bp@suse.de>
Thanks Rui!
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] x86/ioapic: Ignore root bridges without a companion ACPI device
2016-09-10 15:40 [PATCH] x86/ioapic: Ignore root bridges without a companion ACPI device Rui Wang
2016-09-10 17:27 ` Borislav Petkov
@ 2016-09-12 21:25 ` Jon Derrick
2016-09-12 21:43 ` Luck, Tony
1 sibling, 1 reply; 5+ messages in thread
From: Jon Derrick @ 2016-09-12 21:25 UTC (permalink / raw)
To: Rui Wang
Cc: bhelgaas, tglx, rjw, mingo, bp, torvalds, peterz, helgaas,
linux-acpi, linux-pci, tony.luck, x86, linux-kernel
On Sat, Sep 10, 2016 at 11:40:45PM +0800, Rui Wang wrote:
> Some PCI root bridges don't have a corresponding ACPI device.
> This can be the case on some old platforms. Don't call acpi_ioapic_add()
> on these bridges because they can't support ioapic hotplug.
Not just old platforms. VMD is a new device which initializes a root port in software without an acpi handle.
What branch is this based on? I can't find the relevant code/commits
^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: [PATCH] x86/ioapic: Ignore root bridges without a companion ACPI device
2016-09-12 21:25 ` Jon Derrick
@ 2016-09-12 21:43 ` Luck, Tony
2016-09-12 21:46 ` Jon Derrick
0 siblings, 1 reply; 5+ messages in thread
From: Luck, Tony @ 2016-09-12 21:43 UTC (permalink / raw)
To: Derrick, Jonathan, Wang, Rui Y
Cc: bhelgaas@google.com, tglx@linutronix.de, rjw@rjwysocki.net,
mingo@kernel.org, bp@alien8.de, torvalds@linux-foundation.org,
peterz@infradead.org, helgaas@kernel.org,
linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org,
x86@kernel.org, linux-kernel@vger.kernel.org
> What branch is this based on? I can't find the relevant code/commits
tip tree. branch x86/apic
-Tony
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] x86/ioapic: Ignore root bridges without a companion ACPI device
2016-09-12 21:43 ` Luck, Tony
@ 2016-09-12 21:46 ` Jon Derrick
0 siblings, 0 replies; 5+ messages in thread
From: Jon Derrick @ 2016-09-12 21:46 UTC (permalink / raw)
To: Luck, Tony
Cc: Wang, Rui Y, bhelgaas@google.com, tglx@linutronix.de,
rjw@rjwysocki.net, mingo@kernel.org, bp@alien8.de,
torvalds@linux-foundation.org, peterz@infradead.org,
helgaas@kernel.org, linux-acpi@vger.kernel.org,
linux-pci@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org
On Mon, Sep 12, 2016 at 03:43:23PM -0600, Luck, Tony wrote:
> > What branch is this based on? I can't find the relevant code/commits
>
> tip tree. branch x86/apic
>
> -Tony
Cheers!
^ permalink raw reply [flat|nested] 5+ messages in thread
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2016-09-10 15:40 [PATCH] x86/ioapic: Ignore root bridges without a companion ACPI device Rui Wang
2016-09-10 17:27 ` Borislav Petkov
2016-09-12 21:25 ` Jon Derrick
2016-09-12 21:43 ` Luck, Tony
2016-09-12 21:46 ` Jon Derrick
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