[PATCH 6/7 v2] auto bind the memory device which is hotpluged before the driver is loaded

[Wen Congyang <wency@cn.fujitsu.com>]

If the memory device is hotpluged before the driver is loaded, the
user cannot see this device under the directory /sys/bus/acpi/devices/,
and the user cannot bind it by hand after the driver is loaded.
This patch introduces a new feature to bind such device when the driver
is being loaded.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
---
 drivers/acpi/acpi_memhotplug.c |   37 ++++++++++++++++++++++++++++++++++++-
 1 files changed, 36 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index 3765375..0010720 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -52,6 +52,9 @@ MODULE_LICENSE("GPL");
 #define MEMORY_POWER_ON_STATE	1
 #define MEMORY_POWER_OFF_STATE	2
 
+static bool auto_probe;
+module_param(auto_probe, bool, S_IRUGO | S_IWUSR);
+
 static int acpi_memory_device_add(struct acpi_device *device);
 static int acpi_memory_device_remove(struct acpi_device *device, int type);
 
@@ -522,12 +525,44 @@ acpi_memory_register_notify_handler(acpi_handle handle,
 				    u32 level, void *ctxt, void **retv)
 {
 	acpi_status status;
-
+	struct acpi_memory_device *mem_device = NULL;
+	unsigned long long current_status;
 
 	status = is_memory_device(handle);
 	if (ACPI_FAILURE(status))
 		return AE_OK;	/* continue */
 
+	if (auto_probe) {
+		/* Get device present/absent information from the _STA */
+		status = acpi_evaluate_integer(handle, "_STA", NULL,
+					       &current_status);
+		if (ACPI_FAILURE(status))
+			goto install;
+
+		/*
+		 * Check for device status. Device should be
+		 * present/enabled/functioning.
+		 */
+		if (!(current_status &
+		      (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
+		       ACPI_STA_DEVICE_FUNCTIONING)))
+			goto install;
+
+		if (acpi_memory_get_device(handle, &mem_device))
+			goto install;
+
+		/* We have bound this device while we register the driver */
+		if (mem_device->state == MEMORY_POWER_ON_STATE)
+			goto install;
+
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+				  "\nauto probe memory device\n"));
+
+		if (acpi_memory_enable_device(mem_device))
+			pr_err(PREFIX "Cannot enable memory device\n");
+	}
+
+install:
 	status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 					     acpi_memory_device_notify, NULL);
 	/* continue */
-- 
1.7.1