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author | Al Viro <viro@zeniv.linux.org.uk> | 2016-10-10 23:02:51 -0400 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-10-10 23:02:51 -0400 |
commit | 3873691e5ab34fa26948643d038a2b98c4437298 (patch) | |
tree | 5327469194c2167830bce38b56a618b754cdbeea /net/ipv4/route.c | |
parent | c2050a454c7f123d7a57fa1d76ff61bd43643abb (diff) | |
parent | aadfa8019e8114539cfa0b1eb2e5a9c83094a590 (diff) | |
download | linux-3873691e5ab34fa26948643d038a2b98c4437298.tar.bz2 |
Merge remote-tracking branch 'ovl/rename2' into for-linus
Diffstat (limited to 'net/ipv4/route.c')
-rw-r--r-- | net/ipv4/route.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index a1f2830d8110..b5b47a26d4ec 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -476,12 +476,18 @@ u32 ip_idents_reserve(u32 hash, int segs) atomic_t *p_id = ip_idents + hash % IP_IDENTS_SZ; u32 old = ACCESS_ONCE(*p_tstamp); u32 now = (u32)jiffies; - u32 delta = 0; + u32 new, delta = 0; if (old != now && cmpxchg(p_tstamp, old, now) == old) delta = prandom_u32_max(now - old); - return atomic_add_return(segs + delta, p_id) - segs; + /* Do not use atomic_add_return() as it makes UBSAN unhappy */ + do { + old = (u32)atomic_read(p_id); + new = old + delta + segs; + } while (atomic_cmpxchg(p_id, old, new) != old); + + return new - segs; } EXPORT_SYMBOL(ip_idents_reserve); |