From abd1026da4a7700a8db370947f75cd17b6ae6f76 Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Sat, 3 Dec 2016 12:34:32 -0800 Subject: [PATCH] hv: acquire vmbus_connection.channel_mutex in vmbus_free_channels() "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 Signed-off-by: K. Y. Srinivasan Cc: Signed-off-by: Greg Kroah-Hartman --- drivers/hv/channel_mgmt.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c index e5d1b0e6c922..26b419203f16 100644 --- a/drivers/hv/channel_mgmt.c +++ b/drivers/hv/channel_mgmt.c @@ -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); } /*