Blackfin: smp: add smp_mb() to keep coherency

After use generic smp helpers, smp_mb() should be added to keep coherency.

Signed-off-by: Steven Miao <realmz6@gmail.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c
index a40151306b77..bb61ae4986e4 100644
--- a/arch/blackfin/mach-common/smp.c
+++ b/arch/blackfin/mach-common/smp.c
@@ -146,7 +146,7 @@ static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
         platform_clear_ipi(cpu, IRQ_SUPPLE_1);
 
         bfin_ipi_data = &__get_cpu_var(bfin_ipi);
-
+        smp_mb();
         while ((pending = xchg(&bfin_ipi_data->bits, 0)) != 0) {
                 msg = 0;
                 do {
@@ -195,7 +195,7 @@ void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
         unsigned long flags;
 
         local_irq_save(flags);
-
+        smp_mb();
         for_each_cpu(cpu, cpumask) {
                 bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
                 smp_mb();