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Revert "blk-cgroup: simplify blkg freeing from initialization failure paths"

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It turns out this was too soon.  blkg_conf_prep does to funky locking games
with the queue lock for this to work properly.

This reverts commit 27b642b07a.

Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230209053523.437927-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2023-02-09 06:35:23 +01:00 committed by Jens Axboe
parent c43332fe02
commit dcb5220143
1 changed files with 20 additions and 7 deletions
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27
block/blk-cgroup.c
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@ -114,8 +114,10 @@ static bool blkcg_policy_enabled(struct gendisk *disk,
return pol && test_bit(pol->plid, disk->blkcg_pols);
}
static void blkg_free(struct blkcg_gq *blkg)
static void blkg_free_workfn(struct work_struct *work)
{
struct blkcg_gq *blkg = container_of(work, struct blkcg_gq,
free_work);
int i;
/*
@ -140,9 +142,23 @@ static void blkg_free(struct blkcg_gq *blkg)
kfree(blkg);
}
static void blkg_free_workfn(struct work_struct *work)
/**
* blkg_free - free a blkg
* @blkg: blkg to free
*
* Free @blkg which may be partially allocated.
*/
static void blkg_free(struct blkcg_gq *blkg)
{
blkg_free(container_of(work, struct blkcg_gq, free_work));
if (!blkg)
return;
/*
* Both ->pd_free_fn() and request queue's release handler may
* sleep, so free us by scheduling one work func
*/
INIT_WORK(&blkg->free_work, blkg_free_workfn);
schedule_work(&blkg->free_work);
}
static void __blkg_release(struct rcu_head *rcu)
@ -153,10 +169,7 @@ static void __blkg_release(struct rcu_head *rcu)
/* release the blkcg and parent blkg refs this blkg has been holding */
css_put(&blkg->blkcg->css);
/* ->pd_free_fn() may sleep, so free from a work queue */
INIT_WORK(&blkg->free_work, blkg_free_workfn);
schedule_work(&blkg->free_work);
blkg_free(blkg);
}
/*