This is a note to let you know that I've just added the patch titled
Drivers: hv: balloon: Do not post pressure status if interrupted
to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From c5e2254f8d63a6654149aa32ac5f2b7dd66a976d Mon Sep 17 00:00:00 2001
From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Date: Sun, 14 Jul 2013 22:38:12 -0700
Subject: 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@xxxxxxxxxxxxx>
Cc: Stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/hv_balloon.c | 8 ++++++++
1 file changed, 8 insertions(+)
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 @@ 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+ * If our transaction ID is no longer current, just don't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,
--
1.8.3.2
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