qtest: use synchronous I/O for char device
Peter reported that rtc-test would periodically hang. It turns out this was due to an EAGAIN occurring on qemu_chr_fe_write. Instead of heavily refactoring qtest, just use a synchronous version of the write operation for qemu_chr_fe_write to address this problem. Reported-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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