How to know if irq is free in linux? -

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how check if irq free before using free_irq() api in linux? in code, function in using free_irq() api getting called many times , irq getting free in first call, in subsequent call kernel crashing while trying free free irq.

so can put condition above free_irq gets called once. :

initialize #define free_irq true

if(free_irq == true) { free_irq(); free_irq = false; }


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