The file drivers/dma/dma-jz4780.c has a probe function that sets up irqs
using devm_request_irq. The probe function then ends with:
err_unregister_dev:
dma_async_device_unregister(dd);
err_disable_clk:
clk_disable_unprepare(jzdma->clk);
return ret;
}
The remove function, on the other hand contains:
of_dma_controller_free(pdev->dev.of_node);
devm_free_irq(&pdev->dev, jzdma->irq, jzdma);
dma_async_device_unregister(&jzdma->dma_device);
The need for calling devm_free_irq explicitly would be that it needs to
occur before dma_async_device_unregister, to eg avoid a reference to a
dangling pointer. But devm_free_irq is implicitly called after the call
to dma_async_device_unregister at the end of the probe function. Which
one is correct?
julia
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