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 <[email protected]>
--- 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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