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