Commit 269f9794 authored Jan 16, 2014 by K. Y. Srinivasan Committed by Greg Kroah-Hartman Feb 07, 2014

Drivers: hv: vmbus: Don't timeout during the initial connection with host



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@microsoft.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent e28bab48

drivers/hv/connection.c

+1 −10

Original line number	Diff line number	Diff line
		@@ -67,7 +67,6 @@ static int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo,
		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(struct vmbus_channel_msginfo *msginfo,
		}

		/* 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);

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