drm_hwcomposer: vsyncworker: Fix deadlock on exit path

vsyncworker::Routine assumes that when -EINTR is returned by
WaitForSignalOrExitLocked the lock as been released, which is not
true, so it hangs if a vsyncworker is never enabled and Exit is
called.

Fixed by releasing lock in vsynworker::Routine on all code paths.

Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/vsyncworker.cpp b/vsyncworker.cpp
index d431d2e..6ac016d 100644
--- a/vsyncworker.cpp
+++ b/vsyncworker.cpp
@@ -120,6 +120,7 @@ void VSyncWorker::Routine() {
   if (!enabled_) {
     ret = WaitForSignalOrExitLocked();
     if (ret == -EINTR) {
+      Unlock();
       return;
     }
   }