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net: snmp: fix 64bit stats on 32bit arches 

I accidentally replaced BH disabling by preemption disabling
in SNMP_ADD_STATS64() and SNMP_UPD_PO_STATS64() on 32bit builds.

For 64bit stats on 32bit arch, we really need to disable BH,
since the "struct u64_stats_sync syncp" might be manipulated
both from process and BH contexts.

Fixes: 6aef70a851 ("net: snmp: kill various STATS_USER() helpers")
Reported-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Tested-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-04-28 06:33:24 -07:00 committed by David S. Miller
parent 8be2748a40
commit ba7863f4d3
1 changed files with 4 additions and 4 deletions
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8
include/net/snmp.h
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@ -166,9 +166,9 @@ struct linux_xfrm_mib {
#define SNMP_ADD_STATS64(mib, field, addend) \
do { \
preempt_disable(); \
local_bh_disable(); \
__SNMP_ADD_STATS64(mib, field, addend); \
preempt_enable(); \
local_bh_enable(); \
} while (0)
#define __SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
@ -184,9 +184,9 @@ struct linux_xfrm_mib {
} while (0)
#define SNMP_UPD_PO_STATS64(mib, basefield, addend) \
do { \
preempt_disable(); \
local_bh_disable(); \
__SNMP_UPD_PO_STATS64(mib, basefield, addend); \
preempt_enable(); \
local_bh_enable(); \
} while (0)
#else
#define __SNMP_INC_STATS64(mib, field) __SNMP_INC_STATS(mib, field)