Drivers: hv: balloon: Do not post pressure status if interrupted
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>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 61b7351..deb5c25 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -975,6 +975,14 @@
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+ * If our transaction ID is no longer current, just don't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,