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Drivers: hv: vmbus: Handle both rescind and offer messages in the same context

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Execute both ressind and offer messages in the same work context. This serializes these
operations and naturally addresses the various corner cases.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2015-02-28 11:18:18 -08:00 committed by Greg Kroah-Hartman
parent ed6cfcc5fd
commit 2dd37cb815
1 changed files with 61 additions and 52 deletions
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113
drivers/hv/channel_mgmt.c
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@ -134,6 +134,34 @@ bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp);
static void vmbus_process_device_unregister(struct work_struct *work)
{
struct device *dev;
struct vmbus_channel *channel = container_of(work,
struct vmbus_channel,
work);
dev = get_device(&channel->device_obj->device);
if (dev) {
vmbus_device_unregister(channel->device_obj);
put_device(dev);
}
}
static void vmbus_sc_creation_cb(struct work_struct *work)
{
struct vmbus_channel *newchannel = container_of(work,
struct vmbus_channel,
work);
struct vmbus_channel *primary_channel = newchannel->primary_channel;
/*
* On entry sc_creation_callback has been already verified to
* be non-NULL.
*/
primary_channel->sc_creation_callback(newchannel);
}
/*
* alloc_channel - Allocate and initialize a vmbus channel object
*/
@ -244,29 +272,6 @@ void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid)
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;
@ -281,11 +286,8 @@ void vmbus_free_channels(void)
* vmbus_process_offer - Process the offer by creating a channel/device
* associated with this offer
*/
static void vmbus_process_offer(struct work_struct *work)
static void vmbus_process_offer(struct vmbus_channel *newchannel)
{
struct vmbus_channel *newchannel = container_of(work,
struct vmbus_channel,
work);
struct vmbus_channel *channel;
bool fnew = true;
bool enq = false;
@ -349,9 +351,19 @@ static void vmbus_process_offer(struct work_struct *work)
newchannel->state = CHANNEL_OPEN_STATE;
if (channel->sc_creation_callback != NULL)
channel->sc_creation_callback(newchannel);
/*
* We need to invoke the sub-channel creation
* callback; invoke this in a seperate work
* context since we are currently running on
* the global work context in which we handle
* messages from the host.
*/
INIT_WORK(&newchannel->work,
vmbus_sc_creation_cb);
queue_work(newchannel->controlwq,
&newchannel->work);
goto done_init_rescind;
return;
}
goto err_free_chan;
@ -392,15 +404,9 @@ static void vmbus_process_offer(struct work_struct *work)
kfree(newchannel->device_obj);
goto err_free_chan;
}
done_init_rescind:
spin_lock_irqsave(&newchannel->lock, flags);
/* The next possible work is rescind handling */
INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
/* Check if rescind offer was already received */
if (newchannel->rescind)
queue_work(newchannel->controlwq, &newchannel->work);
spin_unlock_irqrestore(&newchannel->lock, flags);
return;
err_free_chan:
free_channel(newchannel);
}
@ -526,8 +532,7 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
newchannel->monitor_grp = (u8)offer->monitorid / 32;
newchannel->monitor_bit = (u8)offer->monitorid % 32;
INIT_WORK(&newchannel->work, vmbus_process_offer);
queue_work(newchannel->controlwq, &newchannel->work);
vmbus_process_offer(newchannel);
}
/*
@ -544,24 +549,28 @@ static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
rescind = (struct vmbus_channel_rescind_offer *)hdr;
channel = relid2channel(rescind->child_relid);
if (channel == NULL)
/* Just return here, no channel found */
if (channel == NULL) {
hv_process_channel_removal(NULL, rescind->child_relid);
return;
}
spin_lock_irqsave(&channel->lock, flags);
channel->rescind = true;
/*
* channel->work.func != vmbus_process_rescind_offer means we are still
* processing offer request and the rescind offer processing should be
* postponed. It will be done at the very end of vmbus_process_offer()
* as rescind flag is being checked there.
*/
if (channel->work.func == vmbus_process_rescind_offer)
/* work is initialized for vmbus_process_rescind_offer() from
* vmbus_process_offer() where the channel got created */
queue_work(channel->controlwq, &channel->work);
spin_unlock_irqrestore(&channel->lock, flags);
if (channel->device_obj) {
/*
* We will have to unregister this device from the
* driver core. Do this in the per-channel work context.
* Note that we are currently executing on the global
* workq for handling messages from the host.
*/
INIT_WORK(&channel->work, vmbus_process_device_unregister);
queue_work(channel->controlwq, &channel->work);
} else {
hv_process_channel_removal(channel,
channel->offermsg.child_relid);
}
}
/*