ACPI: resource: Add helper function acpi_dev_get_memory_resources()

[ Upstream commit 6bb057bfd9d509755349cd2a6ca5e5e6e6071304 ]

Wrapper function that finds all memory type resources by
using acpi_dev_get_resources(). It removes the need for the
drivers to check the resource data type separately.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Stable-dep-of: c3194949ae8f ("usb: typec: intel_pmc_mux: Don't leak the ACPI device reference count")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index f6317bc417ab13887fa520b57c98fc890853e88c..3b9f89487336583c1d0c22132c2dfaac9b446d65 100644 (file)
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -788,6 +788,23 @@ int acpi_dev_get_dma_resources(struct acpi_device *adev, struct list_head *list)
 }
 EXPORT_SYMBOL_GPL(acpi_dev_get_dma_resources);
 
+/**
+ * acpi_dev_get_memory_resources - Get current memory resources of a device.
+ * @adev: ACPI device node to get the resources for.
+ * @list: Head of the resultant list of resources (must be empty).
+ *
+ * This is a helper function that locates all memory type resources of @adev
+ * with acpi_dev_get_resources().
+ *
+ * The number of resources in the output list is returned on success, an error
+ * code reflecting the error condition is returned otherwise.
+ */
+int acpi_dev_get_memory_resources(struct acpi_device *adev, struct list_head *list)
+{
+       return acpi_dev_get_resources(adev, list, is_memory, NULL);
+}
+EXPORT_SYMBOL_GPL(acpi_dev_get_memory_resources);
+
 /**
  * acpi_dev_filter_resource_type - Filter ACPI resource according to resource
  *                                types

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 2d7df5cea2494b8afa00b2c4bdce3562ca68f13c..a23a5aea9c817798f4ca1f6d23b8a5c062bd18da 100644 (file)
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -484,6 +484,7 @@ int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
                           void *preproc_data);
 int acpi_dev_get_dma_resources(struct acpi_device *adev,
                               struct list_head *list);
+int acpi_dev_get_memory_resources(struct acpi_device *adev, struct list_head *list);
 int acpi_dev_filter_resource_type(struct acpi_resource *ares,
                                  unsigned long types);