From 074db6921f5abe1170f670d2b0d1f1e101c10cba Mon Sep 17 00:00:00 2001 From: Wen Congyang Date: Thu, 25 Oct 2012 12:14:39 +1100 Subject: [PATCH] acpi_memhotplug.c: auto bind the memory device which is hotplugged before the driver is loaded If the memory device is hotplugged 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 Cc: Len Brown Cc: "Brown, Len" Cc: Yasuaki ISIMATU Cc: David Rientjes Cc: Konrad Rzeszutek Wilk Signed-off-by: Andrew Morton --- drivers/acpi/acpi_memhotplug.c | 37 +++++++++++++++++++++++++++++++++- 1 file changed, 36 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c index 669e140e81bc..05be17ada0a2 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); @@ -543,12 +546,44 @@ 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, + ¤t_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 */ -- 2.39.5