[PATCH 3/5] hv: init percpu_list in hv_synic_alloc()

From: kys
Date: Wed Dec 07 2016 - 02:36:38 EST


From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
---
drivers/hv/hv.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index c326c67..c11393c 100644
--- 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.
*/
--
1.7.4.1