| Date | Thu, 11 Apr 2013 16:25:21 -0400 | From | Steven Rostedt <> | Subject | [ 018/171 ] bnx2x: fix occasional statistics off-by-4GB error |
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3.6.11.2 stable review patch. If anyone has any objections, please let me know.
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From: =?UTF-8?q?Maciej=20=C5=BBenczykowski?= <maze@google.com>
[ Upstream commit b009aac12cd0fe34293c68af8ac48b85be3bd858 ]
The UPDATE_QSTAT function introduced on February 15, 2012 in commit 1355b704b9ba "bnx2x: consistent statistics after internal driver reload" incorrectly fails to handle overflow during addition of the lower 32-bit field of a stat.
This bug is present since 3.4-rc1 and should thus be considered a candidate for stable 3.4+ releases.
Google-Bug-Id: 8374428 Signed-off-by: Maciej Żenczykowski <maze@google.com> Cc: Mintz Yuval <yuvalmin@broadcom.com> Acked-by: Eilon Greenstein <eilong@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> --- drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.h index 24b8e50..06bd1c0 100644 --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.h +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.h @@ -453,8 +453,9 @@ struct bnx2x_fw_port_stats_old { #define UPDATE_QSTAT(s, t) \ do { \ - qstats->t##_hi = qstats_old->t##_hi + le32_to_cpu(s.hi); \ qstats->t##_lo = qstats_old->t##_lo + le32_to_cpu(s.lo); \ + qstats->t##_hi = qstats_old->t##_hi + le32_to_cpu(s.hi) \ + + ((qstats->t##_lo < qstats_old->t##_lo) ? 1 : 0); \ } while (0) #define UPDATE_QSTAT_OLD(f) \ -- 1.7.10.4
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