sysfs_unbre...e_protection(9)

okay bestie, welcome to the Kernel API Manual page for sysfs_unbreak_active_protection(9) 💖✨ this one is short but the safety note is lowkey important.

🎀 NAME 🎀

• sysfs_unbreak_active_protection — restore "active" protection 💅

✨ SYNOPSIS ✨

void sysfs_unbreak_active_protection (struct kernfs_node *kn );

🌸 ARGUMENTS 🌸

• kn — the pointer returned by sysfs_break_active_protection. That's it, that's the argument 🫶

🦋 DESCRIPTION 🦋

okay so this function literally undoes the effects of sysfs_break_active_protection 😌. Since this function calls kernfs_put on the kernfs node that corresponds to the 'attr' argument passed to sysfs_break_active_protection, that attribute may have been removed between the sysfs_break_active_protection and sysfs_unbreak_active_protection calls.

so fr fr: it is not safe to access kn after this function has returned. no cap, don't do it 😭💀

🌈 SEE ALSO 🌈

these are the references, periodt:

• Kernel file ./fs/sysfs/file.c
• sysfs_create_file_ns(9)
• sysfs_add_file_to_group(9)
• sysfs_chmod_file(9)
• sysfs_break_active_protection(9)
• sysfs_remove_file_ns(9)
• sysfs_remove_file_self(9)
• sysfs_remove_file_from_group(9)
• sysfs_create_bin_file(9)
• sysfs_remove_bin_file(9)
• sysfs_link_change_owner(9)
• sysfs_file_change_owner(9)
• sysfs_change_owner(9)
• sysfs_emit(9)
• sysfs_emit_at(9)
• sysfs_bin_attr_simple_read(9)

okay bye bestie!! source/version: ./fs/sysfs · date: October 2026 · footer title: sysfs_unbre...e_protection(9) 🎀💖✨