Commit a2eff9dd authored by Steven Miao's avatar Steven Miao Committed by Bob Liu

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: default avatarSteven Miao <realmz6@gmail.com>
Signed-off-by: default avatarBob Liu <lliubbo@gmail.com>
parent 7d157fb0
......@@ -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);
......
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