linux-kernel - [RFC PATCH v2 10/12] ACPI: Update container driver for hotplug framework

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Message-Id: <1357861230-29549-11-git-send-email-toshi.kani@hp.com>
Date:	Thu, 10 Jan 2013 16:40:28 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	rjw@...k.pl, lenb@...nel.org, gregkh@...uxfoundation.org,
	akpm@...ux-foundation.org
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org, bhelgaas@...gle.com,
	isimatu.yasuaki@...fujitsu.com, jiang.liu@...wei.com,
	wency@...fujitsu.com, guohanjun@...wei.com, yinghai@...nel.org,
	srivatsa.bhat@...ux.vnet.ibm.com, Toshi Kani <toshi.kani@...com>
Subject: [RFC PATCH v2 10/12] ACPI: Update container driver for hotplug framework

Changed container_notify_cb() to request a hotplug operation by
calling shp_submit_req().  It no longer initiates hot-add by calling
acpi_bus_add().  Also, it no longer sets device->flags.eject_pending
and generates KOBJ_OFFLINE event for hot-delete.

Signed-off-by: Toshi Kani <toshi.kani@...com>
---
 drivers/acpi/container.c |   95 ++++++++++++++++++----------------------------
 1 file changed, 37 insertions(+), 58 deletions(-)

diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index 811910b..89af4fc 100644
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -35,6 +35,7 @@
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 #include <acpi/container.h>
+#include <acpi/sys_hotplug.h>
 
 #define PREFIX "ACPI: "
 
@@ -135,77 +136,37 @@ static int acpi_container_remove(struct acpi_device *device, int type)
 	return status;
 }
 
-static int container_device_add(struct acpi_device **device, acpi_handle handle)
-{
-	acpi_handle phandle;
-	struct acpi_device *pdev;
-	int result;
-
-
-	if (acpi_get_parent(handle, &phandle)) {
-		return -ENODEV;
-	}
-
-	if (acpi_bus_get_device(phandle, &pdev)) {
-		return -ENODEV;
-	}
-
-	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
-		return -ENODEV;
-	}
-
-	result = acpi_bus_start(*device);
-
-	return result;
-}
-
-static void container_notify_cb(acpi_handle handle, u32 type, void *context)
+static void container_notify_cb(acpi_handle handle, u32 event, void *context)
 {
 	struct acpi_device *device = NULL;
-	int result;
-	int present;
-	acpi_status status;
+	struct shp_request *shp_req;
+	enum shp_operation shp_op;
 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 
-	switch (type) {
+	switch (event) {
 	case ACPI_NOTIFY_BUS_CHECK:
 		/* Fall through */
 	case ACPI_NOTIFY_DEVICE_CHECK:
-		pr_debug("Container driver received %s event\n",
-		       (type == ACPI_NOTIFY_BUS_CHECK) ?
-		       "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
-
-		present = is_device_present(handle);
-		status = acpi_bus_get_device(handle, &device);
-		if (!present) {
-			if (ACPI_SUCCESS(status)) {
-				/* device exist and this is a remove request */
-				device->flags.eject_pending = 1;
-				kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
-				return;
-			}
-			break;
+		if (!is_device_present(handle)) {
+			acpi_handle_err(handle, "Device not enabled\n");
+			goto err;
 		}
 
-		if (!ACPI_FAILURE(status) || device)
-			break;
-
-		result = container_device_add(&device, handle);
-		if (result) {
-			acpi_handle_warn(handle, "Failed to add container\n");
-			break;
+		if (!acpi_bus_get_device(handle, &device)) {
+			acpi_handle_err(handle, "Device added already\n");
+			goto err;
 		}
 
-		kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
-		ost_code = ACPI_OST_SC_SUCCESS;
+		shp_op = SHP_HOTPLUG_ADD;
 		break;
 
 	case ACPI_NOTIFY_EJECT_REQUEST:
-		if (!acpi_bus_get_device(handle, &device) && device) {
-			device->flags.eject_pending = 1;
-			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
-			return;
+		if (acpi_bus_get_device(handle, &device)) {
+			acpi_handle_err(handle, "Device not added yet\n");
+			goto err;
 		}
+
+		shp_op = SHP_HOTPLUG_DEL;
 		break;
 
 	default:
@@ -213,8 +174,26 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 		return;
 	}
 
-	/* Inform firmware that the hotplug operation has completed */
-	(void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
+	shp_req = shp_alloc_request(shp_op);
+	if (!shp_req) {
+		acpi_handle_err(handle, "No memory to request hotplug\n");
+		goto err;
+	}
+
+	shp_req->handle = (void *)handle;
+	shp_req->event = event;
+
+	if (shp_submit_req(shp_req)) {
+		acpi_handle_err(handle, "Failed to request hotplug\n");
+		kfree(shp_req);
+		goto err;
+	}
+
+	return;
+
+err:
+	/* Inform firmware that the hotplug operation completed w/ error */
+	(void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
 	return;
 }
 
--
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