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-rw-r--r--drivers/hv/hv.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 6098e0cbdb4b..e2b331045464 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -250,6 +250,13 @@ int hv_synic_cleanup(unsigned int cpu)
unsigned long flags;
/*
+ * Hyper-V does not provide a way to change the connect CPU once
+ * it is set; we must prevent the connect CPU from going offline.
+ */
+ if (cpu == VMBUS_CONNECT_CPU)
+ return -EBUSY;
+
+ /*
* Search for channels which are bound to the CPU we're about to
* cleanup. In case we find one and vmbus is still connected we need to
* fail, this will effectively prevent CPU offlining. There is no way