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ACPI / EC: Cleanup boot EC code using acpi_ec_alloc() 

Failure handling of the boot EC code is not tidy. This patch cleans
them up with acpi_ec_alloc().

This patch also changes acpi_ec_dsdt_probe(), always switches the
boot EC from the ECDT one to the DSDT one in this function.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lv Zheng 2016-06-21 17:42:05 +08:00 committed by Rafael J. Wysocki
parent a99cde438d
commit fd6231e785
1 changed files with 48 additions and 37 deletions
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85
drivers/acpi/ec.c
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@ -1348,13 +1348,9 @@ static void ec_remove_handlers(struct acpi_ec *ec)
}
}
static int acpi_ec_add(struct acpi_device *device)
static struct acpi_ec *acpi_ec_alloc(void)
{
struct acpi_ec *ec = NULL;
int ret;
strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_EC_CLASS);
struct acpi_ec *ec;
/* Check for boot EC */
if (boot_ec) {
@ -1365,9 +1361,21 @@ static int acpi_ec_add(struct acpi_device *device)
first_ec = NULL;
} else {
ec = make_acpi_ec();
if (!ec)
return -ENOMEM;
}
return ec;
}
static int acpi_ec_add(struct acpi_device *device)
{
struct acpi_ec *ec = NULL;
int ret;
strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_EC_CLASS);
ec = acpi_ec_alloc();
if (!ec)
return -ENOMEM;
if (ec_parse_device(device->handle, 0, ec, NULL) !=
AE_CTRL_TERMINATE) {
kfree(ec);
@ -1454,27 +1462,31 @@ static const struct acpi_device_id ec_device_ids[] = {
int __init acpi_ec_dsdt_probe(void)
{
acpi_status status;
struct acpi_ec *ec;
int ret;
if (boot_ec)
return 0;
ec = acpi_ec_alloc();
if (!ec)
return -ENOMEM;
/*
* Finding EC from DSDT if there is no ECDT EC available. When this
* function is invoked, ACPI tables have been fully loaded, we can
* walk namespace now.
*/
boot_ec = make_acpi_ec();
if (!boot_ec)
return -ENOMEM;
status = acpi_get_devices(ec_device_ids[0].id,
ec_parse_device, boot_ec, NULL);
if (ACPI_FAILURE(status) || !boot_ec->handle)
return -ENODEV;
if (!ec_install_handlers(boot_ec)) {
first_ec = boot_ec;
return 0;
ec_parse_device, ec, NULL);
if (ACPI_FAILURE(status) || !ec->handle) {
ret = -ENODEV;
goto error;
}
return -EFAULT;
ret = ec_install_handlers(ec);
error:
if (ret)
kfree(ec);
else
first_ec = boot_ec = ec;
return ret;
}
#if 0
@ -1548,12 +1560,13 @@ static struct dmi_system_id ec_dmi_table[] __initdata = {
int __init acpi_ec_ecdt_probe(void)
{
int ret = 0;
int ret;
acpi_status status;
struct acpi_table_ecdt *ecdt_ptr;
struct acpi_ec *ec;
boot_ec = make_acpi_ec();
if (!boot_ec)
ec = acpi_ec_alloc();
if (!ec)
return -ENOMEM;
/*
* Generate a boot ec context
@ -1583,22 +1596,20 @@ int __init acpi_ec_ecdt_probe(void)
* MSI MS-171F
* https://bugzilla.kernel.org/show_bug.cgi?id=12461
*/
boot_ec->command_addr = ecdt_ptr->data.address;
boot_ec->data_addr = ecdt_ptr->control.address;
ec->command_addr = ecdt_ptr->data.address;
ec->data_addr = ecdt_ptr->control.address;
} else {
boot_ec->command_addr = ecdt_ptr->control.address;
boot_ec->data_addr = ecdt_ptr->data.address;
ec->command_addr = ecdt_ptr->control.address;
ec->data_addr = ecdt_ptr->data.address;
}
boot_ec->gpe = ecdt_ptr->gpe;
boot_ec->handle = ACPI_ROOT_OBJECT;
ret = ec_install_handlers(boot_ec);
if (!ret)
first_ec = boot_ec;
ec->gpe = ecdt_ptr->gpe;
ec->handle = ACPI_ROOT_OBJECT;
ret = ec_install_handlers(ec);
error:
if (ret) {
kfree(boot_ec);
boot_ec = NULL;
}
if (ret)
kfree(ec);
else
first_ec = boot_ec = ec;
return ret;
}