1 files changed, 5 insertions, 1 deletions

diff --git a/arch/powerpc/sysdev/xics/icp-hv.c b/arch/powerpc/sysdev/xics/icp-hv.c
index 14469cf9df68..df0fc5821469 100644
--- a/arch/powerpc/sysdev/xics/icp-hv.c
+++ b/arch/powerpc/sysdev/xics/icp-hv.c
@@ -65,7 +65,11 @@ static inline void icp_hv_set_xirr(unsigned int value)
 static inline void icp_hv_set_qirr(int n_cpu , u8 value)
 {
         int hw_cpu = get_hard_smp_processor_id(n_cpu);
-        long rc = plpar_hcall_norets(H_IPI, hw_cpu, value);
+        long rc;
+
+        /* Make sure all previous accesses are ordered before IPI sending */
+        mb();
+        rc = plpar_hcall_norets(H_IPI, hw_cpu, value);
         if (rc != H_SUCCESS) {
                 pr_err("%s: bad return code qirr cpu=%d hw_cpu=%d mfrr=0x%x "
                         "returned %ld\n", __func__, n_cpu, hw_cpu, value, rc);