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FillBuf: don't poll a second time on EOF #2801

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Nov 20, 2023
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FillBuf: don't poll a second time on EOF #2801

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2 changes: 2 additions & 0 deletions futures-util/src/io/fill_buf.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,8 @@ where
let reader = this.reader.take().expect("Polled FillBuf after completion");

match Pin::new(&mut *reader).poll_fill_buf(cx) {
// We don't need to poll a second time for EOF, and doing so is likely to return Poll::Pending
Poll::Ready(Ok(&[])) => Poll::Ready(Ok(&[])),
// With polonius it is possible to remove this inner match and just have the correct
// lifetime of the reference inferred based on which branch is taken
Poll::Ready(Ok(_)) => match Pin::new(reader).poll_fill_buf(cx) {
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