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io_uring: iopoll requests should also wake task ->in_idle state

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commit c93cc9e16d88e0f5ea95d2d65d58a8a4dab258bc upstream.

If we're freeing/finishing iopoll requests, ensure we check if the task
is in idling in terms of cancelation. Otherwise we could end up waiting
forever in __io_uring_task_cancel() if the task has active iopoll
requests that need cancelation.

Cc: stable@vger.kernel.org # 5.9+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2021-01-16 11:52:11 -07:00 committed by Greg Kroah-Hartman
parent 371f3fbf4f
commit ca75872dd9
1 changed files with 4 additions and 0 deletions
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4
fs/io_uring.c
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@ -2167,6 +2167,8 @@ static void io_req_free_batch_finish(struct io_ring_ctx *ctx,
struct io_uring_task *tctx = rb->task->io_uring;
percpu_counter_sub(&tctx->inflight, rb->task_refs);
if (atomic_read(&tctx->in_idle))
wake_up(&tctx->wait);
put_task_struct_many(rb->task, rb->task_refs);
rb->task = NULL;
}
@ -2186,6 +2188,8 @@ static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req)
struct io_uring_task *tctx = rb->task->io_uring;
percpu_counter_sub(&tctx->inflight, rb->task_refs);
if (atomic_read(&tctx->in_idle))
wake_up(&tctx->wait);
put_task_struct_many(rb->task, rb->task_refs);
}
rb->task = req->task;