[PATCH net 2/3] net: core: add netdev_class_has_file_ns() helper function
From: Taehee Yoo <ap420073@gmail.com>
Date: 2020-03-24 12:31:14
Also in:
lkml
Subsystem:
networking drivers, networking [general], the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
This helper function is to check whether the class file "/sys/class/net*"
is existing or not.
In the next patch, this helper function will be used.
Reported-by: syzbot+830c6dbfc71edc4f0b8f@syzkaller.appspotmail.com
Fixes: b76cdba9cdb2 ("[PATCH] bonding: add sysfs functionality to bonding (large)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
---
include/linux/netdevice.h | 2 +-
net/core/net-sysfs.c | 13 +++++++++++++
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 6c3f7032e8d9..e32edca79e3a 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h@@ -4545,7 +4545,7 @@ int netdev_class_create_file_ns(const struct class_attribute *class_attr, const void *ns); void netdev_class_remove_file_ns(const struct class_attribute *class_attr, const void *ns); - +bool netdev_class_has_file_ns(const char *name, const void *ns); static inline int netdev_class_create_file(const struct class_attribute *class_attr) { return netdev_class_create_file_ns(class_attr, NULL);
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 4c826b8bf9b1..78de063201bc 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c@@ -1781,6 +1781,19 @@ void netdev_class_remove_file_ns(const struct class_attribute *class_attr, } EXPORT_SYMBOL(netdev_class_remove_file_ns); +bool netdev_class_has_file_ns(const char *name, const void *ns) +{ + struct kernfs_node *kn; + + kn = class_find_and_get_file_ns(&net_class, name, ns); + if (kn) { + kernfs_put(kn); + return true; + } + return false; +} +EXPORT_SYMBOL(netdev_class_has_file_ns); + int __init netdev_kobject_init(void) { kobj_ns_type_register(&net_ns_type_operations);
--
2.17.1