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io_uring: synchronise IOPOLL on task_submit fail

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commit 81b6d05ccad4f3d8a9dfb091fb46ad6978ee40e4 upstream

io_req_task_submit() might be called for IOPOLL, do the fail path under
uring_lock to comply with IOPOLL synchronisation based solely on it.

Cc: stable@vger.kernel.org # 5.5+
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pavel Begunkov
2021-01-12 21:17:24 +00:00
committed by Greg Kroah-Hartman
parent bca9ca5a60
commit 1d5e50da5c
1 changed files with 6 additions and 5 deletions
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11
fs/io_uring.c
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@@ -2047,14 +2047,15 @@ static void io_req_task_cancel(struct callback_head *cb)
static void __io_req_task_submit(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
bool fail;
if (!__io_sq_thread_acquire_mm(ctx)) {
mutex_lock(&ctx->uring_lock);
fail = __io_sq_thread_acquire_mm(ctx);
mutex_lock(&ctx->uring_lock);
if (!fail)
__io_queue_sqe(req, NULL);
mutex_unlock(&ctx->uring_lock);
} else {
else
__io_req_task_cancel(req, -EFAULT);
}
mutex_unlock(&ctx->uring_lock);
}
static void io_req_task_submit(struct callback_head *cb)