While the lock is held, the device issues an interrupt, which causes your interrupt handler to run.

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Every interrupt runs a function called an interrupt handler, which must be tailored to the device and therefore is installed by the device driver.

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The interrupt handler, before accessing the device, must also obtain the lock.

而且中斷服務(wù)函數(shù)在設(shè)備被訪問之前也需要獲得鎖。

If an interrupt comes in from an I/O device, the kernel effectively stops the current task, runs the interrupt handler, and then returns to the current task.

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An interrupt handler will then re-enable the device queue with netif_start_queue so that the kernel can restart transmissions.

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At the same time,on the basis of analyzing the contactless IC card's working process and RC531's operating principles,we partition the contactless device driver into the initialization module,the command executing module,the interrupt handler routine, the seeking card module, the card's power-on and power-off module,as well as read/write operating module,and then implement each module in detail.

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By reducing the levels of the device driver, using the DMA pipeline and reusing the Interrupt handler, the cost of software declines a lot, and the performance of RAM is utilized sufficiently.

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This function registers a handler, first making sure that the requested interrupt is a valid one, and that it is not already allocated to another device unless both devices understand shared IRQs (see the later section "Interrupt sharing").

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