Messages in this thread Patch in this message | | | From | Rui Wang <> | Subject | [PATCH v3 5/5] x86/ioapic: Fix ioapic failing to request resource | Date | Wed, 10 Aug 2016 12:01:58 +0800 |
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handle_ioapic_add() uses request_resource() to request ACPI "_CRS" resources. This can fail with the following error message:
[ 247.325693] ACPI: \_SB_.IIO1.AID1: failed to insert resource
This happens when there are multiple IOAPICs and DSDT groups their "_CRS" resources as the children of a parent resource, as seen from /proc/iomem:
fec00000-fecfffff : PNP0003:00 fec00000-fec003ff : IOAPIC 0 fec01000-fec013ff : IOAPIC 1 fec40000-fec403ff : IOAPIC 2
In this case request_resource() fails because there's a conflicting resource which is the parent (fec0000-fecfffff). Fix it by using insert_resource() which can request resources by taking the conflicting resource as the parent.
Signed-off-by: Rui Wang <rui.y.wang@intel.com> --- drivers/acpi/ioapic.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/ioapic.c b/drivers/acpi/ioapic.c index ee20111..6d7ce6e 100644 --- a/drivers/acpi/ioapic.c +++ b/drivers/acpi/ioapic.c @@ -146,10 +146,12 @@ static acpi_status handle_ioapic_add(acpi_handle handle, u32 lvl, crs_res = &ioapic->res; acpi_walk_resources(handle, METHOD_NAME__CRS, setup_res, crs_res); + crs_res->name = type; + crs_res->flags |= IORESOURCE_BUSY; if (crs_res->flags == 0) { acpi_handle_warn(handle, "failed to get resource\n"); goto exit_release; - } else if (request_resource(&iomem_resource, crs_res)) { + } else if (insert_resource(&iomem_resource, crs_res)) { acpi_handle_warn(handle, "failed to insert resource\n"); goto exit_release; } -- 1.8.3.1
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