From: Lv Zheng <lv.zheng@intel.com>
Date: Wed, 30 Nov 2016 07:21:34 +0000 (+0800)
Subject: ACPICA: Tables: Add an error message complaining driver bugs
X-Git-Tag: v4.10-rc1~151^2~3^2~1
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=173fcf80269969378c1ce4cb96b8f518f7081855;p=linux.git

ACPICA: Tables: Add an error message complaining driver bugs

ACPICA commit 68af3c3aa238dd8040e846ac6b4827a016434d8d

During early OS boot stage, drivers that have mapped system memory should
unmap it during the same stage. Linux kernel has an error message
indicating the unbalanced early memory mappings.

This patch back ports such error message into ACPICA for the early table
mappings, so that ACPICA development environment is also aware of this OS
specific requirement and thus is able to ensure the consistent quality
locally. Lv Zheng.

Link: https://github.com/acpica/acpica/commit/68af3c3a
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/drivers/acpi/acpica/tbxface.c b/drivers/acpi/acpica/tbxface.c
index 4ab6b9cd0aec..d5adb7ac4684 100644
--- a/drivers/acpi/acpica/tbxface.c
+++ b/drivers/acpi/acpica/tbxface.c
@@ -167,6 +167,7 @@ ACPI_EXPORT_SYMBOL_INIT(acpi_initialize_tables)
 acpi_status ACPI_INIT_FUNCTION acpi_reallocate_root_table(void)
 {
 	acpi_status status;
+	u32 i;
 
 	ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
 
@@ -178,6 +179,21 @@ acpi_status ACPI_INIT_FUNCTION acpi_reallocate_root_table(void)
 		return_ACPI_STATUS(AE_SUPPORT);
 	}
 
+	/*
+	 * Ensure OS early boot logic, which is required by some hosts. If the
+	 * table state is reported to be wrong, developers should fix the
+	 * issue by invoking acpi_put_table() for the reported table during the
+	 * early stage.
+	 */
+	for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
+		if (acpi_gbl_root_table_list.tables[i].pointer) {
+			ACPI_ERROR((AE_INFO,
+				    "Table [%4.4s] is not invalidated during early boot stage",
+				    acpi_gbl_root_table_list.tables[i].
+				    signature.ascii));
+		}
+	}
+
 	acpi_gbl_root_table_list.flags |= ACPI_ROOT_ALLOW_RESIZE;
 
 	status = acpi_tb_resize_root_table_list();