提交 0da73d00 编写于 作者: M Minwoo Im 提交者: Jens Axboe

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: NMinwoo Im <minwoo.im.dev@gmail.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
上级 5efac89c
......@@ -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);
......@@ -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
......
......@@ -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
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