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-rw-r--r--src/gallium/state_trackers/wgl/stw_framebuffer.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/gallium/state_trackers/wgl/stw_framebuffer.c b/src/gallium/state_trackers/wgl/stw_framebuffer.c
index 7d7248e0030..b49bc22e21f 100644
--- a/src/gallium/state_trackers/wgl/stw_framebuffer.c
+++ b/src/gallium/state_trackers/wgl/stw_framebuffer.c
@@ -55,6 +55,7 @@ stw_framebuffer_from_hwnd_locked(HWND hwnd)
for (fb = stw_dev->fb_head; fb != NULL; fb = fb->next)
if (fb->hWnd == hwnd) {
stw_framebuffer_lock(fb);
+ assert(fb->mutex.RecursionCount == 1);
return fb;
}