smp: bf561: and smb_wmb()/smp_rmb() at ipi send/receive

add smb_wmb()/smp_rmb() to keep cache coherent

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

1 files changed, 8 insertions, 4 deletions

diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c
index 82f301c117a5..2bbae0783819 100644
--- a/arch/blackfin/mach-common/smp.c
+++ b/arch/blackfin/mach-common/smp.c
@@ -146,6 +146,7 @@ static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
 
         platform_clear_ipi(cpu, IRQ_SUPPLE_1);
 
+        smp_rmb();
         bfin_ipi_data = &__get_cpu_var(bfin_ipi);
         while ((pending = atomic_xchg(&bfin_ipi_data->bits, 0)) != 0) {
                 msg = 0;
@@ -161,18 +162,20 @@ static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
                         case BFIN_IPI_CALL_FUNC:
                                 generic_smp_call_function_interrupt();
                                 break;
-
                         case BFIN_IPI_CALL_FUNC_SINGLE:
                                 generic_smp_call_function_single_interrupt();
                                 break;
-
                         case BFIN_IPI_CPU_STOP:
                                 ipi_cpu_stop(cpu);
                                 break;
+                        default:
+                                goto out;
                         }
                         atomic_dec(&bfin_ipi_data->count);
                 } while (msg < BITS_PER_LONG);
+
         }
+out:
         return IRQ_HANDLED;
 }
 
@@ -198,10 +201,11 @@ void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
                 bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
                 atomic_set_mask((1 << msg), &bfin_ipi_data->bits);
                 atomic_inc(&bfin_ipi_data->count);
-                platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1);
         }
-
         local_irq_restore(flags);
+        smp_wmb();
+        for_each_cpu(cpu, cpumask)
+                platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1);
 }
 
 void arch_send_call_function_single_ipi(int cpu)