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block, bfq: get a ref to a group when adding it to a service tree

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commit db37a34c563bf4692b36990ae89005c031385e52 upstream.

BFQ schedules generic entities, which may represent either bfq_queues
or groups of bfq_queues. When an entity is inserted into a service
tree, a reference must be taken, to make sure that the entity does not
disappear while still referred in the tree. Unfortunately, such a
reference is mistakenly taken only if the entity represents a
bfq_queue. This commit takes a reference also in case the entity
represents a group.

Tested-by: Oleksandr Natalenko <[email protected]>
Tested-by: Chris Evich <[email protected]>
Signed-off-by: Paolo Valente <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Paolo Valente 2020-02-03 11:40:59 +01:00 • committed by Greg Kroah-Hartman
commit 92ed51e651
3 changed files with 12 additions and 3 deletions
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2
block/bfq-cgroup.c
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@ -332,7 +332,7 @@ static void bfqg_put(struct bfq_group *bfqg)
kfree(bfqg);
}
static void bfqg_and_blkg_get(struct bfq_group *bfqg)
void bfqg_and_blkg_get(struct bfq_group *bfqg)
{
/* see comments in bfq_bic_update_cgroup for why refcounting bfqg */
bfqg_get(bfqg);