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io_uring: io_free_req() via tw

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io_free_req() is not often used but nevertheless problematic as there is
no way to know the current context, it may be used from the submission
path or even by an irq handler. Push it to a fresh context using
task_work.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/3a92fe80bb068757e51aaa0b105cfbe8f5dfee9e.1680576071.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2023-04-04 13:39:48 +01:00 committed by Jens Axboe
parent 2ad4c6d080
commit 03adabe81a
1 changed files with 7 additions and 1 deletions
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8
io_uring/io_uring.c
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@ -1116,7 +1116,7 @@ static inline void io_dismantle_req(struct io_kiocb *req)
io_put_file(req->file);
}
__cold void io_free_req(struct io_kiocb *req)
static __cold void io_free_req_tw(struct io_kiocb *req, struct io_tw_state *ts)
{
struct io_ring_ctx *ctx = req->ctx;
@ -1130,6 +1130,12 @@ __cold void io_free_req(struct io_kiocb *req)
spin_unlock(&ctx->completion_lock);
}
__cold void io_free_req(struct io_kiocb *req)
{
req->io_task_work.func = io_free_req_tw;
io_req_task_work_add(req);
}
static void __io_req_find_next_prep(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;