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hv: acquire vmbus_connection.channel_mutex in vmbus_free_channels()

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"kernel BUG at drivers/hv/channel_mgmt.c:350!" is observed when hv_vmbus
module is unloaded. BUG_ON() was introduced in commit 85d9aa7051
("Drivers: hv: vmbus: add an API vmbus_hvsock_device_unregister()") as
vmbus_free_channels() codepath was apparently forgotten.

Fixes: 85d9aa7051 ("Drivers: hv: vmbus: add an API vmbus_hvsock_device_unregister()")

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2016-12-03 12:34:32 -08:00 committed by Greg Kroah-Hartman
parent f45be72c8e
commit abd1026da4
1 changed files with 2 additions and 0 deletions
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2
drivers/hv/channel_mgmt.c
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@ -389,6 +389,7 @@ 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 */
@ -396,6 +397,7 @@ void vmbus_free_channels(void)
vmbus_device_unregister(channel->device_obj);
}
mutex_unlock(&vmbus_connection.channel_mutex);
}
/*