linux-kernel - [PATCH] ACPI / PCI / hotplug: Avoid warning when

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Date:	Wed, 27 Nov 2013 13:33:09 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	rjw@...ysocki.net, bhelgaas@...gle.com
Cc:	linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Toshi Kani <toshi.kani@...com>
Subject: [PATCH] ACPI / PCI / hotplug: Avoid warning when _ADR not present

acpiphp_enumerate_slots() walks ACPI namenamespace under
a PCI host bridge with callback register_slot().
register_slot() evaluates _ADR for all the device objects
and emits a warning message for any error.  Some platforms
have _HID device objects (such as HPET and IPMI), which
trigger unnecessary warning messages.

This patch avoids emitting a warning message when a target
device object does not have _ADR.

Signed-off-by: Toshi Kani <toshi.kani@...com>
---
Patch is based on Linus's tree (3.13-rc1).
---
 drivers/pci/hotplug/acpiphp_glue.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 1cf605f..438a4d0 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -279,7 +279,9 @@ static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data,
 
 	status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
 	if (ACPI_FAILURE(status)) {
-		acpi_handle_warn(handle, "can't evaluate _ADR (%#x)\n", status);
+		if (status != AE_NOT_FOUND)
+			acpi_handle_warn(handle,
+				"can't evaluate _ADR (%#x)\n", status);
 		return AE_OK;
 	}
 
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