kobject: don't use WARN for registration failures

commit 3e14c6abbfb5c94506edda9d8e2c145d79375798 upstream.

This WARNING proved to be noisy. The function still returns an error
and callers should handle it. That's how most of kernel code works.
Downgrade the WARNING to pr_err() and leave WARNINGs for kernel bugs.

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Reported-by: syzbot+209c0f67f99fec8eb14b@syzkaller.appspotmail.com
Reported-by: syzbot+7fb6d9525a4528104e05@syzkaller.appspotmail.com
Reported-by: syzbot+2e63711063e2d8f9ea27@syzkaller.appspotmail.com
Reported-by: syzbot+de73361ee4971b6e6f75@syzkaller.appspotmail.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/lib/kobject.c b/lib/kobject.c
index 445dcaeb0f56de7882a1b1278a90ef7931f4099c..b733a83e5294d08c8ca0e806c3209115283361e7 100644 (file)
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -234,14 +234,12 @@ static int kobject_add_internal(struct kobject *kobj)
 
                /* be noisy on error issues */
                if (error == -EEXIST)
-                       WARN(1, "%s failed for %s with "
-                            "-EEXIST, don't try to register things with "
-                            "the same name in the same directory.\n",
-                            __func__, kobject_name(kobj));
+                       pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory.\n",
+                              __func__, kobject_name(kobj));
                else
-                       WARN(1, "%s failed for %s (error: %d parent: %s)\n",
-                            __func__, kobject_name(kobj), error,
-                            parent ? kobject_name(parent) : "'none'");
+                       pr_err("%s failed for %s (error: %d parent: %s)\n",
+                              __func__, kobject_name(kobj), error,
+                              parent ? kobject_name(parent) : "'none'");
        } else
                kobj->state_in_sysfs = 1;