From: David Lechner <david@xxxxxxxxxxxxxx> [Upstream commit 87a2b65fc855e6be50f791c2ebbb492541896827] 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@xxxxxxxxxxxxxx> Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx> Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxx> --- drivers/power/supply/power_supply_sysfs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c index eb5dc74..2ccaf4f 100644 --- a/drivers/power/supply/power_supply_sysfs.c +++ b/drivers/power/supply/power_supply_sysfs.c @@ -91,7 +91,8 @@ 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; } -- 1.7.9.5
