linux-kernel - [PATCH 2/4] Drivers: hv: Make the vmbus driver unloadable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 12 Dec 2011 09:29:17 -0800
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, virtualization@...ts.osdl.org,
	ohering@...e.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: [PATCH 2/4] 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@...rosoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 drivers/hv/channel_mgmt.c |   11 +++++++++++
 drivers/hv/hv.c           |    3 +++
 drivers/hv/hyperv_vmbus.h |    1 +
 drivers/hv/vmbus_drv.c    |   11 +++++++++++
 4 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index b91af50..36484db 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 0fb100e..f8a77d0 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 0aee112..6d7d286 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 0c048dd..aafee6b 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -779,8 +779,19 @@ 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);
 
 module_init(hv_acpi_init);
+module_exit(vmbus_exit);
-- 
1.7.4.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/