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authorAlexey Starikovskiy <astarikovskiy@suse.de>2008-01-01 14:12:55 -0500
committerLen Brown <len.brown@intel.com>2008-01-01 14:12:55 -0500
commitc04209a7948b95e8c52084e8595e74e9428653d3 (patch)
tree8a7bed4071550e333f1a5e81558fc55a470cd554 /drivers/acpi
parente697789d64f8748cb219d7f5c413c512953802cc (diff)
ACPI: EC: Enable boot EC before bus_scan
Some _STA methods called during bus_scan() might require EC region handler, which might be enabled later in the scan. Enable it explicitly before scan to avoid errors. Reference: http://bugzilla.kernel.org/show_bug.cgi?id=9627 Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/ec.c14
-rw-r--r--drivers/acpi/scan.c6
2 files changed, 19 insertions, 1 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index d411017f8c0..97dc16155a5 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -892,6 +892,17 @@ static int acpi_ec_stop(struct acpi_device *device, int type)
return 0;
}
+int __init acpi_boot_ec_enable(void)
+{
+ if (!boot_ec || boot_ec->handlers_installed)
+ return 0;
+ if (!ec_install_handlers(boot_ec)) {
+ first_ec = boot_ec;
+ return 0;
+ }
+ return -EFAULT;
+}
+
int __init acpi_ec_ecdt_probe(void)
{
int ret;
@@ -924,9 +935,10 @@ int __init acpi_ec_ecdt_probe(void)
goto error;
/* We really need to limit this workaround, the only ASUS,
* which needs it, has fake EC._INI method, so use it as flag.
+ * Keep boot_ec struct as it will be needed soon.
*/
if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x)))
- goto error;
+ return -ENODEV;
}
ret = ec_install_handlers(boot_ec);
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 5b4d462117c..cbfe9ae7a9e 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1449,6 +1449,8 @@ static int acpi_bus_scan_fixed(struct acpi_device *root)
return result;
}
+int __init acpi_boot_ec_enable(void);
+
static int __init acpi_scan_init(void)
{
int result;
@@ -1480,6 +1482,10 @@ static int __init acpi_scan_init(void)
* Enumerate devices in the ACPI namespace.
*/
result = acpi_bus_scan_fixed(acpi_root);
+
+ /* EC region might be needed at bus_scan, so enable it now */
+ acpi_boot_ec_enable();
+
if (!result)
result = acpi_bus_scan(acpi_root, &ops);