[PATCH 3.14 057/228] PNP / ACPI: Do not return errors if _DIS or _SRS are not present

Greg Kroah-Hartman
2014-06-05T00:38:45Z

From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

commit a8d22396302b7e4e5f0a594c1c1594388c29edaf upstream.

The ACPI PNP subsystem returns errors from pnpacpi_set_resources()
and pnpacpi_disable_resources() if the _SRS or _DIS methods are not
present, respectively, but it should not do that, because those
methods are optional. For this reason, modify pnpacpi_set_resources()
and pnpacpi_disable_resources(), respectively, to ignore missing _SRS
or _DIS.

This problem has been uncovered by commit 202317a573b2 (ACPI / scan:
Add acpi_device objects for all device nodes in the namespace) and
manifested itself by causing serial port suspend to fail on some
systems.

Fixes: 202317a573b2 (ACPI / scan: Add acpi_device objects for all device nodes in the namespace)
References: https://bugzilla.kernel.org/show_bug.cgi?id=74371
Reported-by: wxg4net <wxg4net@gmail.com>
Reported-and-tested-by: <nonproffessional@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/pnp/pnpacpi/core.c | 44 ++++++++++++++++++++++++++------------------
1 file changed, 26 insertions(+), 18 deletions(-)

--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -83,8 +83,7 @@ static int pnpacpi_set_resources(struct
{
struct acpi_device *acpi_dev;
acpi_handle handle;
- struct acpi_buffer buffer;
- int ret;
+ int ret = 0;

pnp_dbg(&dev->dev, "set resources\n");

@@ -97,19 +96,26 @@ static int pnpacpi_set_resources(struct
if (WARN_ON_ONCE(acpi_dev != dev->data))
dev->data = acpi_dev;

- ret = pnpacpi_build_resource_template(dev, &buffer);
- if (ret)
- return ret;
- ret = pnpacpi_encode_resources(dev, &buffer);
- if (ret) {
+ if (acpi_has_method(handle, METHOD_NAME__SRS)) {
+ struct acpi_buffer buffer;
+
+ ret = pnpacpi_build_resource_template(dev, &buffer);
+ if (ret)
+ return ret;
+
+ ret = pnpacpi_encode_resources(dev, &buffer);
+ if (!ret) {
+ acpi_status status;
+
+ status = acpi_set_current_resources(handle, &buffer);
+ if (ACPI_FAILURE(status))
+ ret = -EIO;
+ }
kfree(buffer.pointer);
- return ret;
}
- if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
- ret = -EINVAL;
- else if (acpi_bus_power_manageable(handle))
+ if (!ret && acpi_bus_power_manageable(handle))
ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
- kfree(buffer.pointer);
+
return ret;
}

@@ -117,7 +123,7 @@ static int pnpacpi_disable_resources(str
{
struct acpi_device *acpi_dev;
acpi_handle handle;
- int ret;
+ acpi_status status;

dev_dbg(&dev->dev, "disable resources\n");

@@ -128,13 +134,15 @@ static int pnpacpi_disable_resources(str
}

/* acpi_unregister_gsi(pnp_irq(dev, 0)); */
- ret = 0;
if (acpi_bus_power_manageable(handle))
acpi_bus_set_power(handle, ACPI_STATE_D3_COLD);
- /* continue even if acpi_bus_set_power() fails */
- if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
- ret = -ENODEV;
- return ret;
+
+ /* continue even if acpi_bus_set_power() fails */
+ status = acpi_evaluate_object(handle, "_DIS", NULL, NULL);
+ if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
+ return -ENODEV;
+
+ return 0;
}

#ifdef CONFIG_ACPI_SLEEP