[Qemu-devel] [PATCH 2/2] hw/pflash_cfi01: Treat read in unknown command state as read

[Peter Maydell]

The code for handling the default "unknown command state" case in
pflash_read in pflash_cfi01.c comments "reset state & treat it as
a read". However the code doesn't actually do this. Moving the
default case to the top of the switch so it can fall through into
the read case brings this file into line with pflash_cfi02 and
makes the code behave as the comments suggest.

The pflash_cfi01 code has always had this bug -- it was presumably
introduced when the original author copied the cfi02 code and
rearranged the order of the switch statement without noticing
that the default case relied on the fall-through.

Signed-off-by: Peter Maydell <address@hidden>
---
 hw/pflash_cfi01.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/hw/pflash_cfi01.c b/hw/pflash_cfi01.c
index 310c716..b30cac6 100644
--- a/hw/pflash_cfi01.c
+++ b/hw/pflash_cfi01.c
@@ -122,6 +122,12 @@ static uint32_t pflash_read (pflash_t *pfl, hwaddr offset,
             __func__, offset, pfl->cmd, width);
 #endif
     switch (pfl->cmd) {
+    default:
+        /* This should never happen : reset state & treat it as a read */
+        DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
+        pfl->wcycle = 0;
+        pfl->cmd = 0;
+        /* fall through to read code */
     case 0x00:
         /* Flash area read */
         p = pfl->storage;
@@ -197,11 +203,6 @@ static uint32_t pflash_read (pflash_t *pfl, hwaddr offset,
         else
             ret = pfl->cfi_table[boff];
         break;
-    default:
-        /* This should never happen : reset state & treat it as a read */
-        DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
-        pfl->wcycle = 0;
-        pfl->cmd = 0;
     }
     return ret;
 }
-- 
1.7.9.5