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[NET]: Fix HH_DATA_OFF.

When the hardware header size is a multiple of HH_DATA_MOD, HH_DATA_OFF()
incorrectly returns HH_DATA_MOD (instead of 0). This affects ieee80211 layer
as 802.11 header is 32 bytes long.

Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
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commit 5ba0eac6e0b7e2889649a1105d97c600595e2bb1 1 parent b597ef4
Jiri Benc authored davem330 committed
Showing with 1 addition and 1 deletion.
  1. +1 −1  include/linux/netdevice.h
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2  include/linux/netdevice.h
@@ -204,7 +204,7 @@ struct hh_cache
/* 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)];
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