blackfin: smp: fix msg queue overflow issue

disable preemption when icache flush and use wait mode cross call, hold the msg
queue lock while handle cross function call to avoid overflow

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

1 files changed, 3 insertions, 5 deletions

diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c
index d3464053dfdb..ac8f8a43158c 100644
--- a/arch/blackfin/mach-common/smp.c
+++ b/arch/blackfin/mach-common/smp.c
@@ -193,14 +193,10 @@ static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
                         scheduler_ipi();
                         break;
                 case BFIN_IPI_CALL_FUNC:
-                        spin_unlock_irqrestore(&msg_queue->lock, flags);
                         ipi_call_function(cpu, msg);
-                        spin_lock_irqsave(&msg_queue->lock, flags);
                         break;
                 case BFIN_IPI_CPU_STOP:
-                        spin_unlock_irqrestore(&msg_queue->lock, flags);
                         ipi_cpu_stop(cpu);
-                        spin_lock_irqsave(&msg_queue->lock, flags);
                         break;
                 default:
                         printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%lx\n",
@@ -482,8 +478,10 @@ void smp_icache_flush_range_others(unsigned long start, unsigned long end)
         smp_flush_data.start = start;
         smp_flush_data.end = end;
 
-        if (smp_call_function(&ipi_flush_icache, &smp_flush_data, 0))
+        preempt_disable();
+        if (smp_call_function(&ipi_flush_icache, &smp_flush_data, 1))
                 printk(KERN_WARNING "SMP: failed to run I-cache flush request on other CPUs\n");
+        preempt_enable();
 }
 EXPORT_SYMBOL_GPL(smp_icache_flush_range_others);