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authorLv Zheng <lv.zheng@intel.com>2016-03-24 05:43:00 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-04-09 04:06:44 +0300
commitfe6cbea0f096bfdb7eafdc7b937570cea8fca00e (patch)
tree5ed7203d3c766dec25b967f7b2199b0f467a652a /drivers/acpi/bus.c
parent59f0aa9480cfef9173a648cec4537addc5f3ad94 (diff)
downloadlinux-fe6cbea0f096bfdb7eafdc7b937570cea8fca00e.tar.xz
ACPI 2.0 / ECDT: Enable correct ECDT initialization order
With wrong ECDT fixes reverted, it is possible to put ECDT probing before acpi_enable_subsystem(). But the ultimate purpose of ECDT re-enabling is to put the ECDT probing before the namespace initialization (acpi_load_tables()). This patch achieves this with protections so that we can enable it later when all necessary corrections are upstreamed. Link 4: https://bugzilla.kernel.org/show_bug.cgi?id=112911 Signed-off-by: Lv Zheng <lv.zheng@intel.com> Tested-by: Chris Bainbridge <chris.bainbridge@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/bus.c')
-rw-r--r--drivers/acpi/bus.c39
1 files changed, 25 insertions, 14 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index c068c829b453..31e8da648fff 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -925,11 +925,13 @@ void __init acpi_early_init(void)
goto error0;
}
- status = acpi_load_tables();
- if (ACPI_FAILURE(status)) {
- printk(KERN_ERR PREFIX
- "Unable to load the System Description Tables\n");
- goto error0;
+ if (acpi_gbl_group_module_level_code) {
+ status = acpi_load_tables();
+ if (ACPI_FAILURE(status)) {
+ printk(KERN_ERR PREFIX
+ "Unable to load the System Description Tables\n");
+ goto error0;
+ }
}
#ifdef CONFIG_X86
@@ -995,17 +997,10 @@ static int __init acpi_bus_init(void)
acpi_os_initialize1();
- status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
- if (ACPI_FAILURE(status)) {
- printk(KERN_ERR PREFIX
- "Unable to start the ACPI Interpreter\n");
- goto error1;
- }
-
/*
* ACPI 2.0 requires the EC driver to be loaded and work before
- * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
- * is called).
+ * the EC device is found in the namespace (i.e. before
+ * acpi_load_tables() is called).
*
* This is accomplished by looking for the ECDT table, and getting
* the EC parameters out of that.
@@ -1013,6 +1008,22 @@ static int __init acpi_bus_init(void)
status = acpi_ec_ecdt_probe();
/* Ignore result. Not having an ECDT is not fatal. */
+ if (!acpi_gbl_group_module_level_code) {
+ status = acpi_load_tables();
+ if (ACPI_FAILURE(status)) {
+ printk(KERN_ERR PREFIX
+ "Unable to load the System Description Tables\n");
+ goto error1;
+ }
+ }
+
+ status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
+ if (ACPI_FAILURE(status)) {
+ printk(KERN_ERR PREFIX
+ "Unable to start the ACPI Interpreter\n");
+ goto error1;
+ }
+
status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");