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net: lan9303: Fix read error execution path

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[ Upstream commit 8964916d20 ]

This patch fixes an issue where a read failure of a port statistic counter
will return unknown results.  While it is highly unlikely the read will
ever fail, it is much cleaner to return a zero for the stat count.

Fixes: a1292595e0 ("net: dsa: add new DSA switch driver for the SMSC-LAN9303")
Signed-off-by: Jerry Ray <jerry.ray@microchip.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20221209153502.7429-1-jerry.ray@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jerry Ray
2022-12-09 09:35:02 -06:00
committed by Greg Kroah-Hartman
parent a8846b3398
commit 4f9bcc9990
1 changed files with 3 additions and 1 deletions
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4
drivers/net/dsa/lan9303-core.c
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@@ -1005,9 +1005,11 @@ static void lan9303_get_ethtool_stats(struct dsa_switch *ds, int port,
ret = lan9303_read_switch_port( ret = lan9303_read_switch_port(
chip, port, lan9303_mib[u].offset, &reg); chip, port, lan9303_mib[u].offset, &reg);
if (ret) if (ret) {
dev_warn(chip->dev, "Reading status port %d reg %u failed\n", dev_warn(chip->dev, "Reading status port %d reg %u failed\n",
port, lan9303_mib[u].offset); port, lan9303_mib[u].offset);
reg = 0;
}
data[u] = reg; data[u] = reg;
} }
} }