6 files changed, 21 insertions, 33 deletions

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index eb30e5ab4cab..b679bf8478f7 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -226,16 +226,6 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
         struct acpi_memory_info *info;
         int node;
 
-
-        /* Get the range from the _CRS */
-        result = acpi_memory_get_device_resources(mem_device);
-        if (result) {
-                dev_err(&mem_device->device->dev,
-                        "get_device_resources failed\n");
-                mem_device->state = MEMORY_INVALID_STATE;
-                return result;
-        }
-
         node = acpi_get_node(mem_device->device->handle);
         /*
          * Tell the VM there is more memory here...
@@ -342,14 +332,6 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
                         break;
                 }
 
-                if (acpi_memory_check_device(mem_device))
-                        break;
-
-                if (acpi_memory_enable_device(mem_device)) {
-                        acpi_handle_err(handle,"Cannot enable memory device\n");
-                        break;
-                }
-
                 ost_code = ACPI_OST_SC_SUCCESS;
                 break;
 
diff --git a/drivers/acpi/apei/erst-dbg.c b/drivers/acpi/apei/erst-dbg.c
index 903549df809b..04ab5c9d3ced 100644
--- a/drivers/acpi/apei/erst-dbg.c
+++ b/drivers/acpi/apei/erst-dbg.c
@@ -111,8 +111,17 @@ retry_next:
         if (rc)
                 goto out;
         /* no more record */
-        if (id == APEI_ERST_INVALID_RECORD_ID)
+        if (id == APEI_ERST_INVALID_RECORD_ID) {
+                /*
+                 * If the persistent store is empty initially, the function
+                 * 'erst_read' below will return "-ENOENT" value. This causes
+                 * 'retry_next' label is entered again. The returned value
+                 * should be zero indicating the read operation is EOF.
+                 */
+                len = 0;
+
                 goto out;
+        }
 retry:
         rc = len = erst_read(id, erst_dbg_buf, erst_dbg_buf_len);
         /* The record may be cleared by others, try read next record */
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index f09dc987cf17..c6ff606c6d5b 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -358,8 +358,7 @@ static struct acpi_device *acpi_dev_pm_get_node(struct device *dev)
         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
         struct acpi_device *adev;
 
-        return handle && ACPI_SUCCESS(acpi_bus_get_device(handle, &adev)) ?
-                adev : NULL;
+        return handle && !acpi_bus_get_device(handle, &adev) ? adev : NULL;
 }
 
 /**
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 01551840d236..95af6f674a6c 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -18,9 +18,14 @@
 
 #define ACPI_GLUE_DEBUG 0
 #if ACPI_GLUE_DEBUG
-#define DBG(x...) printk(PREFIX x)
+#define DBG(fmt, ...)                                           \
+        printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
 #else
-#define DBG(x...) do { } while(0)
+#define DBG(fmt, ...)                                           \
+do {                                                            \
+        if (0)                                                  \
+                printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__);   \
+} while (0)
 #endif
 static LIST_HEAD(bus_type_list);
 static DECLARE_RWSEM(bus_type_sem);
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 7db61b8fa11f..6e7b9d523812 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -445,11 +445,8 @@ int acpi_power_resource_register_device(struct device *dev, acpi_handle handle)
                 return -ENODEV;
 
         ret = acpi_bus_get_device(handle, &acpi_dev);
-        if (ret)
-                goto no_power_resource;
-
-        if (!acpi_dev->power.flags.power_resources)
-                goto no_power_resource;
+        if (ret || !acpi_dev->power.flags.power_resources)
+                return -ENODEV;
 
         powered_device = kzalloc(sizeof(*powered_device), GFP_KERNEL);
         if (!powered_device)
@@ -471,10 +468,6 @@ int acpi_power_resource_register_device(struct device *dev, acpi_handle handle)
         }
 
         return ret;
-
-no_power_resource:
-        printk(KERN_DEBUG PREFIX "Invalid Power Resource to register!\n");
-        return -ENODEV;
 }
 EXPORT_SYMBOL_GPL(acpi_power_resource_register_device);
 
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 53502d1bbf26..c88be6c37c30 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1346,7 +1346,7 @@ static void acpi_device_set_id(struct acpi_device *device)
                         acpi_add_id(device, ACPI_DOCK_HID);
                 else if (!acpi_ibm_smbus_match(device))
                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
-                else if (!acpi_device_hid(device) &&
+                else if (list_empty(&device->pnp.ids) &&
                          ACPI_IS_ROOT_DEVICE(device->parent)) {
                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);