[PATCH] irqchip/gic-v3: use dsb(ishst) to synchronize data to smp before issuing ipi

[Barry Song]

dsb(ishst) should be enough here as we only need to guarantee the
visibility of data to other CPUs in smp inner domain before we
send the ipi.

Signed-off-by: Barry Song <song.bao.hua@xxxxxxxxxxxxx>
---
 drivers/irqchip/irq-gic-v3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 5e935d97207d..0efe1a9a9f3b 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1211,7 +1211,7 @@ static void gic_ipi_send_mask(struct irq_data *d, const struct cpumask *mask)
 	 * Ensure that stores to Normal memory are visible to the
 	 * other CPUs before issuing the IPI.
 	 */
-	wmb();
+	dsb(ishst);
 
 	for_each_cpu(cpu, mask) {
 		u64 cluster_id = MPIDR_TO_SGI_CLUSTER_ID(cpu_logical_map(cpu));
-- 
2.25.1