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Commit 0da73d00 authored by Minwoo Im's avatar Minwoo Im Committed by Jens Axboe
Browse files

blk-mq: code clean-up by adding an API to clear set->mq_map 



set->mq_map is now currently cleared if something goes wrong when
establishing a queue map in blk-mq-pci.c.  It's also cleared before
updating a queue map in blk_mq_update_queue_map().

This patch provides an API to clear set->mq_map to make it clear.

Signed-off-by: default avatarMinwoo Im <minwoo.im.dev@gmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 5efac89c

block/blk-mq-pci.c

+3 −2
Original line number Diff line number Diff line
@@ -17,6 +17,8 @@ 
#include <linux/pci.h>

#include <linux/module.h>



#include "blk-mq.h"



/**

 * blk_mq_pci_map_queues - provide a default queue mapping for PCI device

 * @set:	tagset to provide the mapping for
@@ -48,8 +50,7 @@ int blk_mq_pci_map_queues(struct blk_mq_tag_set *set, struct pci_dev *pdev, 


fallback:

	WARN_ON_ONCE(set->nr_hw_queues > 1);

	for_each_possible_cpu(cpu)

		set->mq_map[cpu] = 0;

	blk_mq_clear_mq_map(set);

	return 0;

}

EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues);

block/blk-mq.c

+1 −3
Original line number Diff line number Diff line
@@ -2683,7 +2683,6 @@ static int blk_mq_alloc_rq_maps(struct blk_mq_tag_set *set) 
static int blk_mq_update_queue_map(struct blk_mq_tag_set *set)

{

	if (set->ops->map_queues) {

		int cpu;

		/*

		 * transport .map_queues is usually done in the following

		 * way:
@@ -2698,8 +2697,7 @@ static int blk_mq_update_queue_map(struct blk_mq_tag_set *set) 
		 * killing stale mapping since one CPU may not be mapped

		 * to any hw queue.

		 */

		for_each_possible_cpu(cpu)

			set->mq_map[cpu] = 0;

		blk_mq_clear_mq_map(set);



		return set->ops->map_queues(set);

	} else

block/blk-mq.h

+8 −0
Original line number Diff line number Diff line
@@ -202,4 +202,12 @@ static inline void blk_mq_put_driver_tag(struct request *rq) 
	__blk_mq_put_driver_tag(hctx, rq);

}



static inline void blk_mq_clear_mq_map(struct blk_mq_tag_set *set)

{

	int cpu;



	for_each_possible_cpu(cpu)

		set->mq_map[cpu] = 0;

}



#endif