linux-kernel - [PATCH] mtd: map: BUG() in non handled cases

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Date:	Thu, 31 Jan 2013 21:06:34 +0400
From:	Dmitry Eremin-Solenikov <dmitry_eremin@...tor.com>
To:	<linux-mtd@...ts.infradead.org>
CC:	<linux-kernel@...r.kernel.org>,
	Artem Bityutskiy <dedekind1@...il.com>,
	David Woodhouse <dwmw2@...radead.org>
Subject: [PATCH] mtd: map: BUG() in non handled cases

Several map-related functions look like a serie of ifs, checking
widths of map. Those functions do not have any handling for default
case. Instead of fiddling with uninitialized_var in those functions,
let's just add a (correct) BUG() to the default case on those maps. This
will also allow us to catch potential errors in maps setup in future.

Signed-off-by: Dmitry Eremin-Solenikov <dmitry_eremin@...tor.com>
Cc: Artem Bityutskiy <dedekind1@...il.com>
Cc: David Woodhouse <dwmw2@...radead.org>
---
 include/linux/mtd/map.h |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/linux/mtd/map.h b/include/linux/mtd/map.h
index f6eb433..1d6ef97 100644
--- a/include/linux/mtd/map.h
+++ b/include/linux/mtd/map.h
@@ -328,7 +328,7 @@ static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word
 
 static inline map_word map_word_load(struct map_info *map, const void *ptr)
 {
-	map_word r = {{0} };
+	map_word r;
 
 	if (map_bankwidth_is_1(map))
 		r.x[0] = *(unsigned char *)ptr;
@@ -342,6 +342,8 @@ static inline map_word map_word_load(struct map_info *map, const void *ptr)
 #endif
 	else if (map_bankwidth_is_large(map))
 		memcpy(r.x, ptr, map->bankwidth);
+	else
+		BUG();
 
 	return r;
 }
@@ -391,7 +393,7 @@ static inline map_word map_word_ff(struct map_info *map)
 
 static inline map_word inline_map_read(struct map_info *map, unsigned long ofs)
 {
-	map_word uninitialized_var(r);
+	map_word r;
 
 	if (map_bankwidth_is_1(map))
 		r.x[0] = __raw_readb(map->virt + ofs);
@@ -425,6 +427,8 @@ static inline void inline_map_write(struct map_info *map, const map_word datum,
 #endif
 	else if (map_bankwidth_is_large(map))
 		memcpy_toio(map->virt+ofs, datum.x, map->bankwidth);
+	else
+		BUG();
 	mb();
 }
 
-- 
1.7.10.4

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