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[BACKPORT,4.19.y,3/3] power: supply: sysfs: ratelimit property read error message

Message ID 117b7b2d9bed2a288676f5614d8dd8d09746ab93.1569404757.git.baolin.wang@linaro.org
State Superseded
Headers show
Series [BACKPORT,4.19.y,1/3] locking/lockdep: Add debug_locks check in __lock_downgrade() | expand

Commit Message

(Exiting) Baolin Wang Sept. 25, 2019, 9:55 a.m. UTC 
From: David Lechner <david@lechnology.com>


[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@lechnology.com>

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>

---
 drivers/power/supply/power_supply_sysfs.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

-- 
1.7.9.5
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Patch

diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index 5a2757a..5358a80 100644
--- 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;
 		}