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doubt regarding :Waking up the request function for Block device drivers??





I was going through the code in linux/drivers/block/ll_rw_blk.c
and had a doubt which i though someone could answer

In a block device , The kernel maintains a global  list of requests in
blk_dev[MAX_BLKDEV]. The request handlers are initalized for a
particular device by
q->request_fn           = rfn;


My question is how does the Kernel signal ("wake up") the appropriate
driver that
"now you have a request that you need to service"


Thanks in advance
 Mathew





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