1 files changed, 56 insertions, 17 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index ae44d8654c82..0476e90b2091 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -142,6 +142,53 @@ static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
 }
 
 /*
+ * acpi_companion_match() - Can we match via ACPI companion device
+ * @dev: Device in question
+ *
+ * Check if the given device has an ACPI companion and if that companion has
+ * a valid list of PNP IDs, and if the device is the first (primary) physical
+ * device associated with it.
+ *
+ * If multiple physical devices are attached to a single ACPI companion, we need
+ * to be careful.  The usage scenario for this kind of relationship is that all
+ * of the physical devices in question use resources provided by the ACPI
+ * companion.  A typical case is an MFD device where all the sub-devices share
+ * the parent's ACPI companion.  In such cases we can only allow the primary
+ * (first) physical device to be matched with the help of the companion's PNP
+ * IDs.
+ *
+ * Additional physical devices sharing the ACPI companion can still use
+ * resources available from it but they will be matched normally using functions
+ * provided by their bus types (and analogously for their modalias).
+ */
+static bool acpi_companion_match(const struct device *dev)
+{
+        struct acpi_device *adev;
+        bool ret;
+
+        adev = ACPI_COMPANION(dev);
+        if (!adev)
+                return false;
+
+        if (list_empty(&adev->pnp.ids))
+                return false;
+
+        mutex_lock(&adev->physical_node_lock);
+        if (list_empty(&adev->physical_node_list)) {
+                ret = false;
+        } else {
+                const struct acpi_device_physical_node *node;
+
+                node = list_first_entry(&adev->physical_node_list,
+                                        struct acpi_device_physical_node, node);
+                ret = node->dev == dev;
+        }
+        mutex_unlock(&adev->physical_node_lock);
+
+        return ret;
+}
+
+/*
  * Creates uevent modalias field for ACPI enumerated devices.
  * Because the other buses does not support ACPI HIDs & CIDs.
  * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
@@ -149,20 +196,14 @@ static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  */
 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
 {
-        struct acpi_device *acpi_dev;
         int len;
 
-        acpi_dev = ACPI_COMPANION(dev);
-        if (!acpi_dev)
-                return -ENODEV;
-
-        /* Fall back to bus specific way of modalias exporting */
-        if (list_empty(&acpi_dev->pnp.ids))
+        if (!acpi_companion_match(dev))
                 return -ENODEV;
 
         if (add_uevent_var(env, "MODALIAS="))
                 return -ENOMEM;
-        len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
+        len = create_modalias(ACPI_COMPANION(dev), &env->buf[env->buflen - 1],
                                 sizeof(env->buf) - env->buflen);
         if (len <= 0)
                 return len;
@@ -179,18 +220,12 @@ EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
  */
 int acpi_device_modalias(struct device *dev, char *buf, int size)
 {
-        struct acpi_device *acpi_dev;
         int len;
 
-        acpi_dev = ACPI_COMPANION(dev);
-        if (!acpi_dev)
+        if (!acpi_companion_match(dev))
                 return -ENODEV;
 
-        /* Fall back to bus specific way of modalias exporting */
-        if (list_empty(&acpi_dev->pnp.ids))
-                return -ENODEV;
-
-        len = create_modalias(acpi_dev, buf, size -1);
+        len = create_modalias(ACPI_COMPANION(dev), buf, size -1);
         if (len <= 0)
                 return len;
         buf[len++] = '\n';
@@ -853,6 +888,9 @@ const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
         if (!ids || !handle || acpi_bus_get_device(handle, &adev))
                 return NULL;
 
+        if (!acpi_companion_match(dev))
+                return NULL;
+
         return __acpi_match_device(adev, ids);
 }
 EXPORT_SYMBOL_GPL(acpi_match_device);
@@ -1470,7 +1508,7 @@ static void acpi_wakeup_gpe_init(struct acpi_device *device)
         if (ACPI_FAILURE(status))
                 return;
 
-        wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HANDLE);
+        wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
 }
 
 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
@@ -2315,6 +2353,7 @@ int __init acpi_scan_init(void)
         acpi_container_init();
         acpi_memory_hotplug_init();
         acpi_pnp_init();
+        acpi_int340x_thermal_init();
 
         mutex_lock(&acpi_scan_lock);
         /*