diff --git a/cuburn/device_code.py b/cuburn/device_code.py
index 441dd24..2c502aa 100644
--- a/cuburn/device_code.py
+++ b/cuburn/device_code.py
@@ -106,6 +106,7 @@ class IterThread(PTXEntryPoint):
 
         label('iter_loop_choose_xform')
         with block("Choose the xform for each warp"):
+            timeout.check_time(5)
             comment("On subsequent runs, only warp 0 will hit this code")
             reg.u32('x_addr x_offset')
             reg.f32('xf_sel')
diff --git a/cuburn/variations.py b/cuburn/variations.py
index 44715fe..483c772 100644
--- a/cuburn/variations.py
+++ b/cuburn/variations.py
@@ -110,7 +110,7 @@ class Variations(PTXFragment):
     @ptx_func
     def linear(self, xo, yo, xi, yi, wgt):
         op.fma.rn.ftz.f32(xo, xi, wgt, xo)
-        op.fma.rn.ftz.f32(yo, yi, wgt, xo)
+        op.fma.rn.ftz.f32(yo, yi, wgt, yo)
 
     @ptx_func
     def sinusoidal(self, xo, yo, xi, yi, wgt):