linux - pm_runtime_put_sync() 函数的功能是什么？

Question

函数pm_runtime_put_sync()在 spi-omap2-mcspi.c 中被调用

有人可以解释一下这个函数调用实际上做了什么吗？谢谢!

Answer 1

它在内部调用 __pm_runtime_idle(dev, RPM_GET_PUT) ，记录为

int __pm_runtime_idle(struct device *dev, int rpmflags)
Entry point for runtime idle operations.
* @dev: Device to send idle notification for.
* @rpmflags: Flag bits.
* * If the RPM_GET_PUT flag is set, decrement the device's usage count and
* return immediately if it is larger than zero. Then carry out an idle
* notification, either synchronous or asynchronous.
*
* This routine may be called in atomic context if the RPM_ASYNC flag is set,
* or if pm_runtime_irq_safe() has been called.

这里是source和 Documentation