pflash_cfi01: Add pflash_cfi01_get_blk() helper

Add an helper to access the opaque struct PFlashCFI01.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20190308131445.17502-9-armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/hw/block/pflash_cfi01.c b/hw/block/pflash_cfi01.c
index 9d1c356..125f70b 100644
--- a/hw/block/pflash_cfi01.c
+++ b/hw/block/pflash_cfi01.c
@@ -967,6 +967,11 @@
     return PFLASH_CFI01(dev);
 }
 
+BlockBackend *pflash_cfi01_get_blk(PFlashCFI01 *fl)
+{
+    return fl->blk;
+}
+
 MemoryRegion *pflash_cfi01_get_memory(PFlashCFI01 *fl)
 {
     return &fl->mem;
diff --git a/include/hw/block/flash.h b/include/hw/block/flash.h
index 914932e..a0f4887 100644
--- a/include/hw/block/flash.h
+++ b/include/hw/block/flash.h
@@ -22,6 +22,7 @@
                                    uint16_t id0, uint16_t id1,
                                    uint16_t id2, uint16_t id3,
                                    int be);
+BlockBackend *pflash_cfi01_get_blk(PFlashCFI01 *fl);
 MemoryRegion *pflash_cfi01_get_memory(PFlashCFI01 *fl);
 
 /* pflash_cfi02.c */