This is a note to let you know that I've just added the patch titled Drivers: hv: get rid of timeout in vmbus_open() to the 4.4-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-get-rid-of-timeout-in-vmbus_open.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 396e287fa2ff46e83ae016cdcb300c3faa3b02f6 Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> Date: Thu, 9 Jun 2016 17:08:56 -0700 Subject: Drivers: hv: get rid of timeout in vmbus_open() From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> commit 396e287fa2ff46e83ae016cdcb300c3faa3b02f6 upstream. vmbus_teardown_gpadl() can result in infinite wait when it is called on 5 second timeout in vmbus_open(). The issue is caused by the fact that gpadl teardown operation won't ever succeed for an opened channel and the timeout isn't always enough. As a guest, we can always trust the host to respond to our request (and there is nothing we can do if it doesn't). Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> Signed-off-by: Sumit Semwal <sumit.semwal@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/hv/channel.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -73,7 +73,6 @@ int vmbus_open(struct vmbus_channel *new void *in, *out; unsigned long flags; int ret, err = 0; - unsigned long t; struct page *page; spin_lock_irqsave(&newchannel->lock, flags); @@ -183,11 +182,7 @@ int vmbus_open(struct vmbus_channel *new goto error1; } - t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); - if (t == 0) { - err = -ETIMEDOUT; - goto error1; - } + wait_for_completion(&open_info->waitevent); spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); list_del(&open_info->msglistentry); Patches currently in stable-queue which might be from vkuznets@xxxxxxxxxx are queue-4.4/drivers-hv-get-rid-of-timeout-in-vmbus_open.patch queue-4.4/drivers-hv-don-t-leak-memory-in-vmbus_establish_gpadl.patch