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power: supply: sysfs: ratelimit property read error message

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This adds rate limiting to the message that is printed when reading a
power supply property via sysfs returns an error. This will prevent
userspace applications from unintentionally dDOSing the system by
continuously reading a property that returns an error.

Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
David Lechner 2018-09-12 19:48:30 -05:00 committed by Sebastian Reichel
parent ae6fe7a387
commit 87a2b65fc8
1 changed files with 2 additions and 1 deletions
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3
drivers/power/supply/power_supply_sysfs.c
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@ -131,7 +131,8 @@ static ssize_t power_supply_show_property(struct device *dev,
dev_dbg(dev, "driver has no data for `%s' property\n",
attr->attr.name);
else if (ret != -ENODEV && ret != -EAGAIN)
dev_err(dev, "driver failed to report `%s' property: %zd\n",
dev_err_ratelimited(dev,
"driver failed to report `%s' property: %zd\n",
attr->attr.name, ret);
return ret;
}