diff --git a/drivers/acpi/acpica/hwvalid.c b/drivers/acpi/acpica/hwvalid.c
index 5f1605874655a2f425aa0c0abd79befcb9684a3c..f8fbea947013136ed78b15ae373972e5e02f6eb6 100644
--- a/drivers/acpi/acpica/hwvalid.c
+++ b/drivers/acpi/acpica/hwvalid.c
@@ -134,6 +134,8 @@ acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width)
 	/* Supported widths are 8/16/32 */
 
 	if ((bit_width != 8) && (bit_width != 16) && (bit_width != 32)) {
+		ACPI_ERROR((AE_INFO,
+			    "Bad BitWidth parameter: %8.8X", bit_width));
 		return AE_BAD_PARAMETER;
 	}