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Drivers: hv: balloon: Do not post pressure status if interrupted

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commit c5e2254f8d63a6654149aa32ac5f2b7dd66a976d upstream.

When we are posting pressure status, we may get interrupted and handle
the un-balloon operation. In this case just don't post the status as we
know the pressure status is stale.

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 2013-07-14 22:38:12 -07:00 committed by Greg Kroah-Hartman
parent 7b7295e5a0
commit e39992ecaa
1 changed files with 8 additions and 0 deletions
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8
drivers/hv/hv_balloon.c
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@ -975,6 +975,14 @@ static void post_status(struct hv_dynmem_device *dm)
dm->num_pages_ballooned +
compute_balloon_floor();
/*
* If our transaction ID is no longer current, just don't
* send the status. This can happen if we were interrupted
* after we picked our transaction ID.
*/
if (status.hdr.trans_id != atomic_read(&trans_id))
return;
vmbus_sendpacket(dm->dev->channel, &status,
sizeof(struct dm_status),
(unsigned long)NULL,