tree cece1704b1aae418f4bd68959ac5e4e03912ac6d
parent 5cad60913dd91fd1817b34ddec90dce9a367c1bc
author Todd Poynor <toddpoynor@google.com> 1356047460 -0800
committer Stephen Boyd <sboyd@codeaurora.org> 1490037368 -0700

cpufreq: interactive: fix race on timer restart on governor start

Starting the governor, or restarting on a hotplugged-in CPU, can race
with the timer start in idle, triggering a BUG on timer already pending.
Start the timer before setting the enable flag, and use enable_sem to
protect the sequence (and ensure correct order of the update to the
enable flag).  Delete any existing timer for safety.

Change-Id: Ife77cf9fe099e8fd8543224cbf148c6722c2ffb0
Reported-by: Francisco Franco <francisco.franco@cloudcar.com>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>