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Staging: hv: make gVmbusConnection.ChannelLock a real spinlock

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Don't use the wrapper functions for this lock, make it a real
lock so that we know what is going on.

I don't think we really want to be doing a irqsave for this code, but I
left it alone to preserve the original codepath.  It should be reviewed
later.

Cc: Hank Janssen <hjanssen@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2009-07-15 14:57:16 -07:00
parent dd0813b6f5
commit 0f5e44ca6e
4 changed files with 16 additions and 13 deletions
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5
drivers/staging/hv/Channel.c
View File

@ -686,6 +686,7 @@ VmbusChannelClose(
int ret=0;
VMBUS_CHANNEL_CLOSE_CHANNEL* msg;
VMBUS_CHANNEL_MSGINFO* info;
unsigned long flags;
DPRINT_ENTER(VMBUS);
@ -729,9 +730,9 @@ VmbusChannelClose(
// since the caller will free the channel
if (Channel->State == CHANNEL_OPEN_STATE)
{
SpinlockAcquire(gVmbusConnection.ChannelLock);
spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
REMOVE_ENTRY_LIST(&Channel->ListEntry);
SpinlockRelease(gVmbusConnection.ChannelLock);
spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
FreeVmbusChannel(Channel);
}

14
drivers/staging/hv/ChannelMgmt.c
View File

@ -233,11 +233,12 @@ VmbusChannelProcessOffer(
LIST_ENTRY* curr;
bool fNew = true;
VMBUS_CHANNEL* channel;
unsigned long flags;
DPRINT_ENTER(VMBUS);
// Make sure this is a new offer
SpinlockAcquire(gVmbusConnection.ChannelLock);
spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelList)
{
@ -255,7 +256,7 @@ VmbusChannelProcessOffer(
{
INSERT_TAIL_LIST(&gVmbusConnection.ChannelList, &newChannel->ListEntry);
}
SpinlockRelease(gVmbusConnection.ChannelLock);
spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
if (!fNew)
{
@ -282,9 +283,9 @@ VmbusChannelProcessOffer(
DPRINT_ERR(VMBUS, "unable to add child device object (relid %d)",
newChannel->OfferMsg.ChildRelId);
SpinlockAcquire(gVmbusConnection.ChannelLock);
spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
REMOVE_ENTRY_LIST(&newChannel->ListEntry);
SpinlockRelease(gVmbusConnection.ChannelLock);
spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
FreeVmbusChannel(newChannel);
}
@ -785,8 +786,9 @@ VmbusChannelReleaseUnattachedChannels(
LIST_ENTRY *entry;
VMBUS_CHANNEL *channel;
VMBUS_CHANNEL *start=NULL;
unsigned long flags;
SpinlockAcquire(gVmbusConnection.ChannelLock);
spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
while (!IsListEmpty(&gVmbusConnection.ChannelList))
{
@ -813,7 +815,7 @@ VmbusChannelReleaseUnattachedChannels(
}
}
SpinlockRelease(gVmbusConnection.ChannelLock);
spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
}
// eof

8
drivers/staging/hv/Connection.c
View File

@ -69,7 +69,7 @@ VmbusConnect(
spin_lock_init(&gVmbusConnection.channelmsg_lock);
INITIALIZE_LIST_HEAD(&gVmbusConnection.ChannelList);
gVmbusConnection.ChannelLock = SpinlockCreate();
spin_lock_init(&gVmbusConnection.channel_lock);
// Setup the vmbus event connection for channel interrupt abstraction stuff
gVmbusConnection.InterruptPage = PageAlloc(1);
@ -156,7 +156,6 @@ VmbusConnect(
gVmbusConnection.ConnectState = Disconnected;
WorkQueueClose(gVmbusConnection.WorkQueue);
SpinlockClose(gVmbusConnection.ChannelLock);
if (gVmbusConnection.InterruptPage)
{
@ -258,8 +257,9 @@ GetChannelFromRelId(
VMBUS_CHANNEL* foundChannel=NULL;
LIST_ENTRY* anchor;
LIST_ENTRY* curr;
unsigned long flags;
SpinlockAcquire(gVmbusConnection.ChannelLock);
spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelList)
{
channel = CONTAINING_RECORD(curr, VMBUS_CHANNEL, ListEntry);
@ -270,7 +270,7 @@ GetChannelFromRelId(
break;
}
}
SpinlockRelease(gVmbusConnection.ChannelLock);
spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
return foundChannel;
}

2
drivers/staging/hv/VmbusPrivate.h
View File

@ -84,7 +84,7 @@ typedef struct _VMBUS_CONNECTION {
// List of channels
LIST_ENTRY ChannelList;
HANDLE ChannelLock;
spinlock_t channel_lock;
HANDLE WorkQueue;
} VMBUS_CONNECTION;