diff --git a/[refs] b/[refs]
index 9b802389355f..219a9b3cbe79 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c37472d3f4ec6bf98b443490e069f31d18bcd6f5
+refs/heads/master: cd705d5ad49bb8894dda2726dcaef8f63ddeba43
diff --git a/trunk/drivers/ata/libata-core.c b/trunk/drivers/ata/libata-core.c
index 3cc7096cfda7..f46fbd3bd3fb 100644
--- a/trunk/drivers/ata/libata-core.c
+++ b/trunk/drivers/ata/libata-core.c
@@ -2942,6 +2942,10 @@ const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
 
 	if (xfer_mode == t->mode)
 		return t;
+
+	WARN_ONCE(true, "%s: unable to find timing for xfer_mode 0x%x\n",
+			__func__, xfer_mode);
+
 	return NULL;
 }