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authorK. Y. Srinivasan <kys@microsoft.com>2015-02-28 22:18:17 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-03-02 06:31:02 +0300
commited6cfcc5fdf2ebca320b6f74c836e555e18216e1 (patch)
tree004638600297de1f56cef2fc075ab1a7c8f52e26 /drivers/hv
parentd15a0301c4157884d1a48a5d76b9ac3e36d71242 (diff)
downloadlinux-ed6cfcc5fdf2ebca320b6f74c836e555e18216e1.tar.xz
Drivers: hv: vmbus: Introduce a function to remove a rescinded offer
In response to a rescind message, we need to remove the channel and the corresponding device. Cleanup this code path by factoring out the code to remove a channel. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/channel.c9
-rw-r--r--drivers/hv/channel_mgmt.c49
-rw-r--r--drivers/hv/vmbus_drv.c11
3 files changed, 49 insertions, 20 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index bf0cf8f3bcaf..9b79aca7e565 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -501,6 +501,15 @@ static int vmbus_close_internal(struct vmbus_channel *channel)
put_cpu();
}
+ /*
+ * If the channel has been rescinded; process device removal.
+ */
+ if (channel->rescind) {
+ hv_process_channel_removal(channel,
+ channel->offermsg.child_relid);
+ return 0;
+ }
+
/* Send a closing message */
msg = &channel->close_msg.msg;
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 0ba6b5c303e6..b93389124ec4 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -207,33 +207,21 @@ static void percpu_channel_deq(void *arg)
list_del(&channel->percpu_list);
}
-/*
- * vmbus_process_rescind_offer -
- * Rescind the offer by initiating a device removal
- */
-static void vmbus_process_rescind_offer(struct work_struct *work)
+
+void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid)
{
- struct vmbus_channel *channel = container_of(work,
- struct vmbus_channel,
- work);
+ struct vmbus_channel_relid_released msg;
unsigned long flags;
struct vmbus_channel *primary_channel;
- struct vmbus_channel_relid_released msg;
- struct device *dev;
-
- if (channel->device_obj) {
- dev = get_device(&channel->device_obj->device);
- if (dev) {
- vmbus_device_unregister(channel->device_obj);
- put_device(dev);
- }
- }
memset(&msg, 0, sizeof(struct vmbus_channel_relid_released));
- msg.child_relid = channel->offermsg.child_relid;
+ msg.child_relid = relid;
msg.header.msgtype = CHANNELMSG_RELID_RELEASED;
vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released));
+ if (channel == NULL)
+ return;
+
if (channel->target_cpu != get_cpu()) {
put_cpu();
smp_call_function_single(channel->target_cpu,
@@ -256,6 +244,29 @@ static void vmbus_process_rescind_offer(struct work_struct *work)
free_channel(channel);
}
+/*
+ * vmbus_process_rescind_offer -
+ * Rescind the offer by initiating a device removal
+ */
+static void vmbus_process_rescind_offer(struct work_struct *work)
+{
+ struct vmbus_channel *channel = container_of(work,
+ struct vmbus_channel,
+ work);
+ struct device *dev;
+
+ if (channel->device_obj) {
+ dev = get_device(&channel->device_obj->device);
+ if (dev) {
+ vmbus_device_unregister(channel->device_obj);
+ put_device(dev);
+ }
+ } else {
+ hv_process_channel_removal(channel,
+ channel->offermsg.child_relid);
+ }
+}
+
void vmbus_free_channels(void)
{
struct vmbus_channel *channel;
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index a12666d075ea..2b7b51d264f1 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -510,14 +510,23 @@ static int vmbus_remove(struct device *child_device)
{
struct hv_driver *drv;
struct hv_device *dev = device_to_hv_device(child_device);
+ u32 relid = dev->channel->offermsg.child_relid;
if (child_device->driver) {
drv = drv_to_hv_drv(child_device->driver);
if (drv->remove)
drv->remove(dev);
- else
+ else {
+ hv_process_channel_removal(dev->channel, relid);
pr_err("remove not set for driver %s\n",
dev_name(child_device));
+ }
+ } else {
+ /*
+ * We don't have a driver for this device; deal with the
+ * rescind message by removing the channel.
+ */
+ hv_process_channel_removal(dev->channel, relid);
}
return 0;