diff --git a/include/linux/mtd/flashchip.h b/include/linux/mtd/flashchip.h
index f43e9b4..23cc10f 100644
--- a/include/linux/mtd/flashchip.h
+++ b/include/linux/mtd/flashchip.h
@@ -92,7 +92,7 @@
 /* This is used to handle contention on write/erase operations
    between partitions of the same physical chip. */
 struct flchip_shared {
-	spinlock_t lock;
+	struct mutex lock;
 	struct flchip *writing;
 	struct flchip *erasing;
 };