It's possible to have an inconsistency in the list due to unprotected operation
on it. The patch adds a proper locking on the list operation.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: NRob Herring <rob.herring@calxeda.com>
Acked-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>