power: supply: sysfs: ratelimit property read error message

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>

diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index 6170ed8b6854b9d53d6cdf25dd27ded822923152..dce24f596160973f4b6e27827741d17e86f7e73c 100644 (file)
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -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;
                }