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Any call to flash_execute_cmd() can interfere with UMA / mapped read access, so grab the mutex first. BUG=b:35587287,b:35848370 BRANCH=reef TEST=Verify SW sync completes 8 hour stress test on kevin. Also verify 'ectool flashspiinfo' succeeds. Change-Id: Ib1b04371546c27517c1b1ac860e9afbc1fed435e Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/447905 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Aseda Aboagye <aaboagye@chromium.org> Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>