io_uring/kbuf: return correct iovec count from classic buffer peek
io_provided_buffers_select() returns 0 to indicate success, but it should
be returning 1 to indicate that 1 vec was mapped. This causes peeking
to fail with classic provided buffers, and while that's not a use case
that anyone should use, it should still work correctly.
The end result is that no buffer will be selected, and hence a completion
with '0' as the result will be posted, without a buffer attached.
Fixes: 35c8711c8f
("io_uring/kbuf: add helpers for getting/peeking multiple buffers")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -129,7 +129,7 @@ static int io_provided_buffers_select(struct io_kiocb *req, size_t *len,
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iov[0].iov_base = buf;
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iov[0].iov_len = *len;
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return 0;
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return 1;
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}
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static struct io_uring_buf *io_ring_head_to_buf(struct io_uring_buf_ring *br,
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