This is a note to let you know that I've just added the patch titled
hv: acquire vmbus_connection.channel_mutex in vmbus_free_channels()
to the 4.8-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:
hv-acquire-vmbus_connection.channel_mutex-in-vmbus_free_channels.patch
and it can be found in the queue-4.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From abd1026da4a7700a8db370947f75cd17b6ae6f76 Mon Sep 17 00:00:00 2001
From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Date: Sat, 3 Dec 2016 12:34:32 -0800
Subject: hv: acquire vmbus_connection.channel_mutex in vmbus_free_channels()
From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
commit abd1026da4a7700a8db370947f75cd17b6ae6f76 upstream.
"kernel BUG at drivers/hv/channel_mgmt.c:350!" is observed when hv_vmbus
module is unloaded. BUG_ON() was introduced in commit 85d9aa705184
("Drivers: hv: vmbus: add an API vmbus_hvsock_device_unregister()") as
vmbus_free_channels() codepath was apparently forgotten.
Fixes: 85d9aa705184 ("Drivers: hv: vmbus: add an API vmbus_hvsock_device_unregister()")
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/channel_mgmt.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -348,6 +348,7 @@ void vmbus_free_channels(void)
{
struct vmbus_channel *channel, *tmp;
+ mutex_lock(&vmbus_connection.channel_mutex);
list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list,
listentry) {
/* hv_process_channel_removal() needs this */
@@ -355,6 +356,7 @@ void vmbus_free_channels(void)
vmbus_device_unregister(channel->device_obj);
}
+ mutex_unlock(&vmbus_connection.channel_mutex);
}
/*
Patches currently in stable-queue which might be from vkuznets@xxxxxxxxxx are
queue-4.8/hv-acquire-vmbus_connection.channel_mutex-in-vmbus_free_channels.patch
--
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