[lkml]   [2019]   [Sep]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[BACKPORT 4.14.y v3 3/3] power: supply: sysfs: ratelimit property read error message
From: David Lechner <>

[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 <>
Signed-off-by: Sebastian Reichel <>
Signed-off-by: Baolin Wang <>
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",
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->, ret);
return ret;
 \ /
  Last update: 2019-09-25 12:04    [W:0.069 / U:8.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site