binder_inc_node_tmpref(9)

okay so bestie, we're looking at binder_inc_node_tmpref(9) from the Kernel API Manual — it's a tiny little function page, but it's got big lock-energy, and we're gonna cover every crumb 💖✨

🎀 NAME 🎀

binder_inc_node_tmpref — take a temporary reference on node.

🦋 SYNOPSIS 🦋

void binder_inc_node_tmpref (struct binder_node *node );

🌸 ARGUMENTS 🌸

• node — node to reference. That's your struct binder_node *, bestie; it's the node getting the temporary ref.

💅 DESCRIPTION 💅

okay so the whole point: take reference on node to prevent the node from being freed while referenced only by a local variable. The inner lock is needed to serialize with the node work on the queue (which isn't needed after the node is dead). If the node is dead (node->proc is NULL), use binder_dead_nodes_lock to protect node->tmp_refs against dead-node-only cases where the node lock cannot be acquired (eg traversing the dead node list to print nodes).

💜 SEE ALSO 💜

Kernel file ./drivers/android/binder.c — and it's linked up with all of these:

• binder_proc_lock(9)
• binder_proc_unlock(9)
• binder_inner_proc_lock(9)
• binder_inner_proc_unlock(9)
• binder_node_lock(9)
• binder_node_unlock(9)
• binder_node_inner_lock(9)
• binder_node_inner_unlock(9)
• binder_worklist_empty(9)
• binder_enqueue_work_ilocked(9)
• binder_enqueue_deferred_thread_work_ilocked(9)
• binder_enqueue_thread_work_ilocked(9)
• binder_enqueue_thread_work(9)
• binder_dequeue_work(9)
• binder_select_thread_ilocked(9)
• binder_wakeup_thread_ilocked(9)
• binder_dec_node_tmpref(9)
• binder_get_ref_for_node_olocked(9)
• binder_inc_ref_olocked(9)
• binder_dec_ref_olocked(9)
• binder_get_node_from_ref(9)
• binder_free_ref(9)
• binder_update_ref_for_handle(9)
• binder_dec_ref_for_handle(9)
• binder_inc_ref_for_node(9)
• binder_thread_dec_tmpref(9)
• binder_proc_dec_tmpref(9)
• binder_get_txn_from(9)
• binder_get_txn_from_and_acq_inner(9)
• binder_free_txn_fixups(9)
• binder_cleanup_transaction(9)
• binder_get_object(9)
• binder_validate_ptr(9)
• binder_validate_fixup(9)
• struct binder_task_work_cb(9)
• binder_do_fd_close(9)
• binder_deferred_fd_close(9)
• struct binder_ptr_fixup(9)
• struct binder_sg_copy(9)
• binder_do_deferred_txn_copies(9)
• binder_cleanup_deferred_txn_lists(9)
• binder_defer_copy(9)
• binder_add_fixup(9)
• binder_can_update_transaction(9)
• binder_find_outdated_transaction_ilocked(9)
• binder_proc_transaction(9)
• binder_get_node_refs_for_txn(9)
• binder_netlink_report(9)
• binder_free_buf(9)
• binder_apply_fd_fixups(9)
• print_next_binder_node_ilocked(9)

mwah 💋 that's the page, bestie. source/version: ./drivers/android; date: October 2026; footer title: binder_inc_node_tmpref(9). periodt 🫶