summaryrefslogtreecommitdiffstats
path: root/drivers
diff options
context:
space:
mode:
authorTalat Batheesh <talatb@mellanox.com>2018-01-21 05:30:42 +0200
committerDavid S. Miller <davem@davemloft.net>2018-01-21 18:06:33 -0500
commite58edaa4863583b54409444f11b4f80dff0af1cd (patch)
tree324a371756a3352eabd8badbe3e209d5c7719d34 /drivers
parentec835f8104a21f4d4eeb9d316ee71d2b4a7f00de (diff)
downloadlinux-e58edaa4863583b54409444f11b4f80dff0af1cd.tar.bz2
net/mlx5e: Fix fixpoint divide exception in mlx5e_am_stats_compare
Helmut reported a bug about division by zero while running traffic and doing physical cable pull test. When the cable unplugged the ppms become zero, so when dividing the current ppms by the previous ppms in the next dim iteration there is division by zero. This patch prevent this division for both ppms and epms. Fixes: c3164d2fc48f ("net/mlx5e: Added BW check for DIM decision mechanism") Reported-by: Helmut Grauer <helmut.grauer@de.ibm.com> Signed-off-by: Talat Batheesh <talatb@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c
index e401d9d245f3..b69a705fd787 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c
@@ -201,9 +201,15 @@ static int mlx5e_am_stats_compare(struct mlx5e_rx_am_stats *curr,
return (curr->bpms > prev->bpms) ? MLX5E_AM_STATS_BETTER :
MLX5E_AM_STATS_WORSE;
+ if (!prev->ppms)
+ return curr->ppms ? MLX5E_AM_STATS_BETTER :
+ MLX5E_AM_STATS_SAME;
+
if (IS_SIGNIFICANT_DIFF(curr->ppms, prev->ppms))
return (curr->ppms > prev->ppms) ? MLX5E_AM_STATS_BETTER :
MLX5E_AM_STATS_WORSE;
+ if (!prev->epms)
+ return MLX5E_AM_STATS_SAME;
if (IS_SIGNIFICANT_DIFF(curr->epms, prev->epms))
return (curr->epms < prev->epms) ? MLX5E_AM_STATS_BETTER :