This is a note to let you know that I've just added the patch titled
Drivers: hv: vmbus: Don't timeout during the initial connection with host
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drivers-hv-vmbus-don-t-timeout-during-the-initial-connection-with-host.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 269f979467cf49f2ea8132316c1f00f8c9678f7c Mon Sep 17 00:00:00 2001
From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Date: Thu, 16 Jan 2014 11:59:58 -0800
Subject: Drivers: hv: vmbus: Don't timeout during the initial connection with host
From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
commit 269f979467cf49f2ea8132316c1f00f8c9678f7c upstream.
When the guest attempts to connect with the host when there may already be a
connection with the host (as would be the case during the kdump/kexec path),
it is difficult to guarantee timely response from the host. Starting with
WS2012 R2, the host supports this ability to re-connect with the host
(explicitly to support kexec). Prior to responding to the guest, the host
needs to ensure that device states based on the previous connection to
the host have been properly torn down. This may introduce unbounded delays.
To deal with this issue, don't do a timed wait during the initial connect
with the host.
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/connection.c | 11 +----------
1 file changed, 1 insertion(+), 10 deletions(-)
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -67,7 +67,6 @@ static int vmbus_negotiate_version(struc
int ret = 0;
struct vmbus_channel_initiate_contact *msg;
unsigned long flags;
- int t;
init_completion(&msginfo->waitevent);
@@ -102,15 +101,7 @@ static int vmbus_negotiate_version(struc
}
/* Wait for the connection response */
- t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ);
- if (t == 0) {
- spin_lock_irqsave(&vmbus_connection.channelmsg_lock,
- flags);
- list_del(&msginfo->msglistentry);
- spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock,
- flags);
- return -ETIMEDOUT;
- }
+ wait_for_completion(&msginfo->waitevent);
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
list_del(&msginfo->msglistentry);
Patches currently in stable-queue which might be from kys@xxxxxxxxxxxxx are
queue-3.12/drivers-hv-vmbus-don-t-timeout-during-the-initial-connection-with-host.patch
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