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mt76: mt7615: fix possible division by 0 in mt7615_mac_update_mib_stats
author
Lorenzo Bianconi
<lorenzo@kernel.org>
Mon, 6 Apr 2020 21:56:30 +0000
(23:56 +0200)
committer
Felix Fietkau
<nbd@nbd.name>
Tue, 12 May 2020 17:52:30 +0000
(19:52 +0200)
Check that val is not zero before aggr_per estimation in order to avoid a
possible division by 0
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
drivers/net/wireless/mediatek/mt76/mt7615/mac.c
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diff --git
a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
index
ed6eb19
..
1ef9888
100644
(file)
--- a/
drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+++ b/
drivers/net/wireless/mediatek/mt76/mt7615/mac.c
@@
-1773,9
+1773,11
@@
mt7615_mac_update_mib_stats(struct mt7615_phy *phy)
val = mt76_get_field(dev, MT_MIB_SDR14(ext_phy),
MT_MIB_AMPDU_MPDU_COUNT);
- val2 = mt76_get_field(dev, MT_MIB_SDR15(ext_phy),
- MT_MIB_AMPDU_ACK_COUNT);
- mib->aggr_per = 1000 * (val - val2) / val;
+ if (val) {
+ val2 = mt76_get_field(dev, MT_MIB_SDR15(ext_phy),
+ MT_MIB_AMPDU_ACK_COUNT);
+ mib->aggr_per = 1000 * (val - val2) / val;
+ }
aggr = ext_phy ? ARRAY_SIZE(dev->mt76.aggr_stats) / 2 : 0;
for (i = 0; i < 4; i++) {