diff --git a/src/mesa/drivers/dri/r300/radeon_ioctl.c b/src/mesa/drivers/dri/r300/radeon_ioctl.c
index 0b8656b..dd5c5ea 100644
--- a/src/mesa/drivers/dri/r300/radeon_ioctl.c
+++ b/src/mesa/drivers/dri/r300/radeon_ioctl.c
@@ -348,8 +348,11 @@ void radeonWaitForIdleLocked(radeonConte
 
 	do {
 		ret = drmCommandNone(radeon->dri.fd, DRM_RADEON_CP_IDLE);
-		if (ret)
+		if (ret) {
+			UNLOCK_HARDWARE(radeon);
 			DO_USLEEP(1);
+			LOCK_HARDWARE(radeon);
+		}
 	} while (ret && ++i < 100);
 
 	if (ret < 0) {