mac80211: path IE fields macros, fix alignment problems and clean up

Signed-off-by: Luis Carlos Cobo <luisca@cozybit.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/mesh_hwmp.c

@@ -7,6 +7,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <asm/unaligned.h>
 #include "mesh.h"
 
 #define IEEE80211_FC(type, stype) cpu_to_le16(type | stype)
@@ -24,40 +25,41 @@
 /* Reply and forward */
 #define MP_F_RF	0x2
 
+static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae)
+{
+	if (ae)
+		offset += 6;
+	return le32_to_cpu(get_unaligned((__le32 *) (preq_elem + offset)));
+}
+
 /* HWMP IE processing macros */
 #define AE_F			(1<<6)
 #define AE_F_SET(x)		(*x & AE_F)
 #define PREQ_IE_FLAGS(x)	(*(x))
 #define PREQ_IE_HOPCOUNT(x)	(*(x + 1))
 #define PREQ_IE_TTL(x)		(*(x + 2))
-#define PREQ_IE_PREQ_ID(x) le32_to_cpu(*((__le32 *) (x + 3)))
+#define PREQ_IE_PREQ_ID(x)	u32_field_get(x, 3, 0)
 #define PREQ_IE_ORIG_ADDR(x)	(x + 7)
-#define PREQ_IE_ORIG_DSN(x) le32_to_cpu(*((__le32 *) (x + 13)))
-#define PREQ_IE_LIFETIME(x) le32_to_cpu(*((__le32 *) \
-			(AE_F_SET(x) ? x + 23 : x + 17)))
-#define PREQ_IE_METRIC(x) le32_to_cpu(*((__le32 *) \
-			(AE_F_SET(x) ? x + 27 : x + 21)))
+#define PREQ_IE_ORIG_DSN(x)	u32_field_get(x, 13, 0);
+#define PREQ_IE_LIFETIME(x)	u32_field_get(x, 17, AE_F_SET(x));
+#define PREQ_IE_METRIC(x) 	u32_field_get(x, 21, AE_F_SET(x));
 #define PREQ_IE_DST_F(x)	(*(AE_F_SET(x) ? x + 32 : x + 26))
 #define PREQ_IE_DST_ADDR(x) 	(AE_F_SET(x) ? x + 33 : x + 27)
-#define PREQ_IE_DST_DSN(x) le32_to_cpu(*((__le32 *) \
-			(AE_F_SET(x) ? x + 39 : x + 33)))
+#define PREQ_IE_DST_DSN(x) 	u32_field_get(x, 33, AE_F_SET(x));
 
 
 #define PREP_IE_FLAGS(x)	PREQ_IE_FLAGS(x)
 #define PREP_IE_HOPCOUNT(x)	PREQ_IE_HOPCOUNT(x)
 #define PREP_IE_TTL(x)		PREQ_IE_TTL(x)
 #define PREP_IE_ORIG_ADDR(x)	(x + 3)
-#define PREP_IE_ORIG_DSN(x) le32_to_cpu(*((__le32 *) (x + 9)))
-#define PREP_IE_LIFETIME(x) le32_to_cpu(*((__le32 *) \
-			(AE_F_SET(x) ? x + 19 : x + 13)))
-#define PREP_IE_METRIC(x) le32_to_cpu(*((__le32 *) \
-			(AE_F_SET(x) ? x + 23 : x + 17)))
+#define PREP_IE_ORIG_DSN(x)	u32_field_get(x, 9, 0);
+#define PREP_IE_LIFETIME(x)	u32_field_get(x, 13, AE_F_SET(x));
+#define PREP_IE_METRIC(x)	u32_field_get(x, 17, AE_F_SET(x));
 #define PREP_IE_DST_ADDR(x)	(AE_F_SET(x) ? x + 27 : x + 21)
-#define PREP_IE_DST_DSN(x) le32_to_cpu(*((__le32 *) \
-			(AE_F_SET(x) ? x + 33 : x + 27)))
+#define PREP_IE_DST_DSN(x)	u32_field_get(x, 27, AE_F_SET(x));
 
 #define PERR_IE_DST_ADDR(x)	(x + 2)
-#define PERR_IE_DST_DSN(x) le32_to_cpu(*((__le32 *) (x + 8)))
+#define PERR_IE_DST_DSN(x)	u32_field_get(x, 8, 0);
 
 #define TU_TO_EXP_TIME(x) (jiffies + msecs_to_jiffies(x * 1024 / 1000))
 #define MSEC_TO_TU(x) (x*1000/1024)