[3/5] netdev: HH_DATA_OFF bugfix

[Jiri Benc]

When the hardware header size is a multiple of HH_DATA_MOD, HH_DATA_OFF()
incorrectly returns HH_DATA_MOD (instead of 0).

Signed-off-by: Jiri Benc <jbenc@xxxxxxx>

--- linux/include/linux/netdevice.h
+++ work/include/linux/netdevice.h
@@ -204,7 +209,7 @@
 	/* cached hardware header; allow for machine alignment needs.        */
 #define HH_DATA_MOD	16
 #define HH_DATA_OFF(__len) \
-	(HH_DATA_MOD - ((__len) & (HH_DATA_MOD - 1)))
+	(HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
 #define HH_DATA_ALIGN(__len) \
 	(((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
 	unsigned long	hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];


--
Jiri Benc
SUSE Labs
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