tree 9ba3fdc258387e5d94355f8230bf5e64d397fc48
parent bb2f3486041aa126cb7ce4929f1e45ede85f0051
author Max Filippov <jcmvbkbc@gmail.com> 1454968958 +0300
committer Chris Zankel <chris@zankel.net> 1457686411 +0000

xtensa: ISS: don't hang if stdin EOF is reached

Simulator stdin may be connected to a file, when its end is reached
kernel hangs in infinite loop inside rs_poll, because simc_poll always
signals that descriptor 0 is readable and simc_read always returns 0.
Check simc_read return value and exit loop if it's not positive. Also
don't rewind polling timer if it's zero.

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>