[PATCH 4.9 109/153] hv: init percpu_list in hv_synic_alloc()

Greg Kroah-Hartman
2017-03-10T10:37:48Z

From: Vitaly Kuznetsov <vkuznets@redhat.com>

commit 3c7630d35009e6635e5b58d62de554fd5b6db5df upstream.

Initializing hv_context.percpu_list in hv_synic_alloc() helps to prevent a
crash in percpu_channel_enq() when not all CPUs were online during
initialization and it naturally belongs there.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/hv/hv.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -457,6 +457,8 @@ int hv_synic_alloc(void)
pr_err("Unable to allocate post msg page\n");
goto err;
}
+
+ INIT_LIST_HEAD(&hv_context.percpu_list[cpu]);
}

return 0;
@@ -552,8 +554,6 @@ void hv_synic_init(void *arg)
rdmsrl(HV_X64_MSR_VP_INDEX, vp_index);
hv_context.vp_index[cpu] = (u32)vp_index;

- INIT_LIST_HEAD(&hv_context.percpu_list[cpu]);
-
/*
* Register the per-cpu clockevent source.
*/