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authorK. Y. Srinivasan <kys@microsoft.com>2011-12-12 09:29:17 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2011-12-12 14:26:50 -0800
commit93e5bd06a95343c701361fa009cdc5a653d6ec8e (patch)
treefe28f7a5ad3c009fbf8e197c94c74b444015630f /drivers/hv
parent8b8ee6753154dd6cfe397e0d29fe7f90a8adb50b (diff)
downloadlinux-93e5bd06a95343c701361fa009cdc5a653d6ec8e.tar.gz
Drivers: hv: Make the vmbus driver unloadable
It turns out that the vmbus driver can be made unloadable. Make it
unloadable.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/channel_mgmt.c11
-rw-r--r--drivers/hv/hv.c3
-rw-r--r--drivers/hv/hyperv_vmbus.h1
-rw-r--r--drivers/hv/vmbus_drv.c11
4 files changed, 26 insertions, 0 deletions
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index b91af50875e9..36484db36baf 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -223,6 +223,17 @@ static void vmbus_process_rescind_offer(struct work_struct *work)
 	vmbus_device_unregister(channel->device_obj);
 }
 
+void vmbus_free_channels(void)
+{
+	struct vmbus_channel *channel;
+
+	list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
+		vmbus_device_unregister(channel->device_obj);
+		kfree(channel->device_obj);
+		free_channel(channel);
+	}
+}
+
 /*
  * vmbus_process_offer - Process the offer by creating a channel/device
  * associated with this offer
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 0fb100ed91a3..f8a77d01a516 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -237,6 +237,9 @@ void hv_cleanup(void)
 {
 	union hv_x64_msr_hypercall_contents hypercall_msr;
 
+	/* Reset our OS id */
+	wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
+
 	kfree(hv_context.signal_event_buffer);
 	hv_context.signal_event_buffer = NULL;
 	hv_context.signal_event_param = NULL;
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 0aee1122734c..6d7d286d5440 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -611,6 +611,7 @@ void vmbus_device_unregister(struct hv_device *device_obj);
 
 struct vmbus_channel *relid2channel(u32 relid);
 
+void vmbus_free_channels(void);
 
 /* Connection interface */
 
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 40956d1c6608..c3875f72b5bf 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -795,8 +795,19 @@ cleanup:
 	return ret;
 }
 
+static void __exit vmbus_exit(void)
+{
+
+	free_irq(irq, hv_acpi_dev);
+	vmbus_free_channels();
+	bus_unregister(&hv_bus);
+	hv_cleanup();
+	acpi_bus_unregister_driver(&vmbus_acpi_driver);
+}
+
 
 MODULE_LICENSE("GPL");
 MODULE_VERSION(HV_DRV_VERSION);
 
 subsys_initcall(hv_acpi_init);
+module_exit(vmbus_exit);