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

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commit 269f979467 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@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan
2014-01-16 11:59:58 -08:00
committed by Greg Kroah-Hartman
parent c7677684ab
commit 3339d76f6c
1 changed files with 1 additions and 10 deletions
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11
drivers/hv/connection.c
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@@ -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);