[PATCH] driver core: Limit the messages on a refused uevent

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Josef Bacik <josef@toxicpanda.com>

A write to a "uevent" file which is no valid action makes
kobject_synth_uevent() print a warning and uevent_store() an error every
time.  This is generally considered a bad thing so rate limit these
messages.

Fixes: b0e37c0d8a6a ("net-sysfs: make sure objects belong to container's owner")
Cc: stable <stable@kernel.org>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/base/core.c  | 4 +++-
 lib/kobject_uevent.c | 6 +++---
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index f21e225abd51..0e2eccd3e613 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2881,7 +2881,9 @@ static ssize_t uevent_store(struct device *dev, const struct device_attribute *a
 	rc = kobject_synth_uevent(&dev->kobj, buf, count);
 
 	if (rc) {
-		dev_err(dev, "uevent: failed to send synthetic uevent: %d\n", rc);
+		dev_err_ratelimited(dev,
+				    "uevent: failed to send synthetic uevent: %d\n",
+				    rc);
 		return rc;
 	}
 
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 1480e2c27ed0..1d29378d4f55 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -223,9 +223,9 @@ int kobject_synth_uevent(struct kobject *kobj, const char *buf, size_t count)
 out:
 	if (r) {
 		devpath = kobject_get_path(kobj, GFP_KERNEL);
-		pr_warn("synth uevent: %s: %s\n",
-		       devpath ?: "unknown device",
-		       msg ?: "failed to send uevent");
+		pr_warn_ratelimited("synth uevent: %s: %s\n",
+				    devpath ?: "unknown device",
+				    msg ?: "failed to send uevent");
 		kfree(devpath);
 	}
 	return r;
-- 
2.56.0