BLK_STOP_QUEUE man page on Oracle

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BLK_STOP_QUEUE(9)		 Block Devices		     BLK_STOP_QUEUE(9)

       blk_stop_queue - stop a queue

       void blk_stop_queue(struct request_queue * q);

	   The struct request_queue in question

       The Linux block layer assumes that a block driver will consume all
       entries on the request queue when the request_fn strategy is called.
       Often this will not happen, because of hardware limitations (queue
       depth settings). If a device driver gets a 'queue full' response, or if
       it simply chooses not to queue more I/O at one point, it can call this
       function to prevent the request_fn from being called until the driver
       has signalled it's ready to go again. This happens by calling
       blk_start_queue to restart queue operations. Queue lock must be held.

Kernel Hackers Manual 3.8.	   June 2014		     BLK_STOP_QUEUE(9)

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