linux-kernel - [PATCH AUTOSEL 4.14 04/10] power: supply: Ratelimit no data debug output

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Message-Id: <20230531134606.3385210-4-sashal@kernel.org>
Date:   Wed, 31 May 2023 09:46:00 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Marek Vasut <marex@...x.de>, Hans de Goede <hdegoede@...hat.com>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Sasha Levin <sashal@...nel.org>, sre@...nel.org,
        linux-pm@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 04/10] power: supply: Ratelimit no data debug output

From: Marek Vasut <marex@...x.de>

[ Upstream commit 155c45a25679f571c2ae57d10db843a9dfc63430 ]

Reduce the amount of output this dev_dbg() statement emits into logs,
otherwise if system software polls the sysfs entry for data and keeps
getting -ENODATA, it could end up filling the logs up.

This does in fact make systemd journald choke, since during boot the
sysfs power supply entries are polled and if journald starts at the
same time, the journal is just being repeatedly filled up, and the
system stops on trying to start journald without booting any further.

Signed-off-by: Marek Vasut <marex@...x.de>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 2ccaf4ff4be47..2cb8a31e9dac0 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -88,7 +88,8 @@ static ssize_t power_supply_show_property(struct device *dev,
 
 		if (ret < 0) {
 			if (ret == -ENODATA)
-				dev_dbg(dev, "driver has no data for `%s' property\n",
+				dev_dbg_ratelimited(dev,
+					"driver has no data for `%s' property\n",
 					attr->attr.name);
 			else if (ret != -ENODEV && ret != -EAGAIN)
 				dev_err_ratelimited(dev,
-- 
2.39.2