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io_uring: fix io_timeout_remove locking

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io_timeout_cancel() posts CQEs so needs ->completion_lock to be held,
so grab it in io_timeout_remove().

Fixes: 48ecb6369f1f2 ("io_uring: run timeouts from task_work")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d6f03d653a4d7bf693ef6f39b6a426b6d97fd96f.1629280204.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-08-18 10:50:52 +01:00 committed by Jens Axboe
parent 23a65db83b
commit ec3c3d0f3a
1 changed files with 10 additions and 4 deletions
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14
fs/io_uring.c
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@ -5572,6 +5572,7 @@ static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx,
}
static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data)
__must_hold(&ctx->completion_lock)
__must_hold(&ctx->timeout_lock)
{
struct io_kiocb *req = io_timeout_extract(ctx, user_data);
@ -5646,13 +5647,18 @@ static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags)
struct io_ring_ctx *ctx = req->ctx;
int ret;
spin_lock_irq(&ctx->timeout_lock);
if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE))
if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) {
spin_lock(&ctx->completion_lock);
spin_lock_irq(&ctx->timeout_lock);
ret = io_timeout_cancel(ctx, tr->addr);
else
spin_unlock_irq(&ctx->timeout_lock);
spin_unlock(&ctx->completion_lock);
} else {
spin_lock_irq(&ctx->timeout_lock);
ret = io_timeout_update(ctx, tr->addr, &tr->ts,
io_translate_timeout_mode(tr->flags));
spin_unlock_irq(&ctx->timeout_lock);
spin_unlock_irq(&ctx->timeout_lock);
}
if (ret < 0)
req_set_fail(req);