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io_uring: safer fallback_work free 

Add extra wq flushing for fallback_work, that's not necessary but safer
if invariants of io_fallback_req_func() change.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/24179419d6748516299600bc914f50b9e0b02275.1633532552.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-10-06 16:06:47 +01:00 committed by Jens Axboe
parent 6d63416dc5
commit 756ab7c0ec
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -1262,7 +1262,6 @@ static __cold void io_fallback_req_func(struct work_struct *work)
mutex_unlock(&ctx->uring_lock);
}
percpu_ref_put(&ctx->refs);
}
static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
@ -9212,6 +9211,7 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
if (ctx->rsrc_backup_node)
io_rsrc_node_destroy(ctx->rsrc_backup_node);
flush_delayed_work(&ctx->rsrc_put_work);
flush_delayed_work(&ctx->fallback_work);
WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list));
WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist));