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-rw-r--r--utils/kmstest.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/utils/kmstest.cpp b/utils/kmstest.cpp
index 06e00ba..698ad25 100644
--- a/utils/kmstest.cpp
+++ b/utils/kmstest.cpp
@@ -1101,6 +1101,9 @@ int main(int argc, char **argv)
Card card(s_device_path);
+ if (!card.is_master())
+ EXIT("Could not get DRM master permission. Card already in use?");
+
if (!card.has_atomic() && s_flip_sync)
EXIT("Synchronized flipping requires atomic modesetting");