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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: Minwoo Im <minwoo.im.dev@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Minwoo Im 2018-07-02 23:46:43 +09:00 committed by Jens Axboe
parent 5efac89c84
commit 0da73d00ca
3 changed files with 12 additions and 5 deletions
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5
block/blk-mq-pci.c
View File

@ -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);

4
block/blk-mq.c
View File

@ -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

8
block/blk-mq.h
View File

@ -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