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io_uring: sqthread should grab ctx->uring_lock for submissions 

We use the mutex to guard against registered file updates, for instance.
Ensure we're safe in accessing that state against concurrent updates.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
alistair/sunxi64-5.5-dsi
Jens Axboe 2019-12-09 14:52:35 -07:00
parent e995d5123e
commit 8a4955ff1c
1 changed files with 2 additions and 5 deletions
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7
fs/io_uring.c
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@ -2996,12 +2996,7 @@ static int io_issue_sqe(struct io_kiocb *req, struct io_kiocb **nxt,
if (req->result == -EAGAIN)
return -EAGAIN;
/* workqueue context doesn't hold uring_lock, grab it now */
if (req->in_async)
mutex_lock(&ctx->uring_lock);
io_iopoll_req_issued(req);
if (req->in_async)
mutex_unlock(&ctx->uring_lock);
}
return 0;
@ -3655,7 +3650,9 @@ static int io_sq_thread(void *data)
}
to_submit = min(to_submit, ctx->sq_entries);
mutex_lock(&ctx->uring_lock);
ret = io_submit_sqes(ctx, to_submit, NULL, -1, &cur_mm, true);
mutex_unlock(&ctx->uring_lock);
if (ret > 0)
inflight += ret;
}