power: supply: sysfs: prevent endless uevent loop with CONFIG_POWER_SUPPLY_DEBUG

[ Upstream commit 349ced9984ff540ce74ca8a0b2e9b03dc434b9dd ]

Fix a similar endless event loop as was done in commit
8dcf32175b4e ("i2c: prevent endless uevent loop with
CONFIG_I2C_DEBUG_CORE"):

  The culprit is the dev_dbg printk in the i2c uevent handler. If
  this is activated (for instance by CONFIG_I2C_DEBUG_CORE) it results
  in an endless loop with systemd-journald.

  This happens if user-space scans the system log and reads the uevent
  file to get information about a newly created device, which seems
  fair use to me. Unfortunately reading the "uevent" file uses the
  same function that runs for creating the uevent for a new device,
  generating the next syslog entry

Both CONFIG_I2C_DEBUG_CORE and CONFIG_POWER_SUPPLY_DEBUG were reported
in https://bugs.freedesktop.org/show_bug.cgi?id=76886 but only former
seems to have been fixed. Drop debug prints as it was done in I2C
subsystem to resolve the issue.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: linux-pm@vger.kernel.org
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index ed2d7fd..488dd7e 100644 (file)
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -277,15 +277,11 @@ int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
        char *prop_buf;
        char *attrname;
 
-       dev_dbg(dev, "uevent\n");
-
        if (!psy || !psy->desc) {
                dev_dbg(dev, "No power supply yet\n");
                return ret;
        }
 
-       dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->desc->name);
-
        ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
        if (ret)
                return ret;
@@ -321,8 +317,6 @@ int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
                        goto out;
                }
 
-               dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
-
                ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
                kfree(attrname);
                if (ret)