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Typically this routine runs on low priority hook task. A pre-emption by a higher priority task might be mistaken for timeout. Double check the transfer done status after the timeout time has passed. Also clear the TXDONE status before starting a fresh transaction to make sure we wait for the current transaction to complete; an errand TXDONE status at start of the transaction will pre-empt waiting for the current transaction and return stale data. BRANCH=none TEST=mn50 stress test fails within minutes vs. now stable. Main test component is higher priority console task that does intermittent compute during usb-spi transfers. Change-Id: Ide4390e42d3957bc45eea8160617a52dd31ed866 Reviewed-on: https://chromium-review.googlesource.com/849662 Commit-Ready: Marius Schilder <mschilder@chromium.org> Tested-by: Marius Schilder <mschilder@chromium.org> Reviewed-by: Marius Schilder <mschilder@chromium.org> Reviewed-by: Nagendra Modadugu <ngm@google.com> Reviewed-by: Nick Sanders <nsanders@chromium.org> Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>