BLK_STOP_QUEUE(9) Block Devices BLK_STOP_QUEUE(9)NAME
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.
COPYRIGHTKernel Hackers Manual 3.8. June 2014 BLK_STOP_QUEUE(9)