usb4_switch..._dp_resource(9)

📦 version 7.3.1, in nixpkgs unstable

💅 usb4_switch_dealloc_dp_resource — from the Kernel API Manual, page usb4_switch..._dp_resource(9)

okay so bestie, this is a kernel API page, the manual is literally called Kernel API Manual, and the whole vibe is one (1) tiny function that hands back a DP IN resource you grabbed earlier. short page, clean energy, let's go ✨

🌸 NAME 🌸

usb4_switch_dealloc_dp_resource — releases an allocated DP IN resource 🎀

🦋 SYNOPSIS 🦋

int usb4_switch_dealloc_dp_resource (struct tb_switch *sw , struct
     tb_port *in );

that's it. that's the whole signature. no cap. 💜

✨ ARGUMENTS ✨

  • sw — the USB4 router 🌈 (this is the switch bestie, the whole hub situation)
  • in — the DP IN adapter 💅 (the specific port-side thing you're giving back)

🧚 DESCRIPTION 🧚

So basically: this function releases the previously allocated DP IN resource. that's the entire plot. you allocated it before, now you're freeing it, and the world keeps spinning. lowkey iconic. 🫶

🔥 RETURN 🔥

  • 0 on success 🎉 — slay, it worked
  • a negative errno otherwise 😭 — something went sideways, check that errno

👑 SEE ALSO 👑

first up, the home base — this lives in the kernel file ./drivers/thunderbolt/usb4.c 🏠

and then, the friend group 🫶 (all of these are (9) man pages, obviously):

  • usb4_switch_check_wakes
  • usb4_switch_setup
  • usb4_switch_configuration_valid
  • usb4_switch_read_uid
  • usb4_switch_drom_read
  • usb4_switch_lane_bonding_possible
  • usb4_switch_set_wake
  • usb4_switch_set_sleep
  • usb4_switch_nvm_sector_size
  • usb4_switch_nvm_read
  • usb4_switch_nvm_set_offset
  • usb4_switch_nvm_write
  • usb4_switch_nvm_authenticate
  • usb4_switch_nvm_authenticate_status
  • usb4_switch_credits_init
  • usb4_switch_query_dp_resource
  • usb4_switch_alloc_dp_resource
  • usb4_port_index
  • usb4_switch_map_pcie_down
  • usb4_switch_map_usb3_down
  • usb4_switch_add_ports
  • usb4_switch_remove_ports
  • usb4_port_unlock
  • usb4_port_hotplug_enable
  • usb4_port_reset
  • usb4_port_configure
  • usb4_port_unconfigure
  • usb4_port_configure_xdomain
  • usb4_port_unconfigure_xdomain
  • usb4_port_sb_read
  • usb4_port_sb_write
  • usb4_port_router_offline
  • usb4_port_router_online
  • usb4_port_enumerate_retimers
  • usb4_port_clx_supported
  • usb4_port_asym_supported
  • usb4_port_asym_set_link_width
  • usb4_port_asym_start
  • usb4_port_margining_caps
  • usb4_port_hw_margin
  • usb4_port_sw_margin
  • usb4_port_sw_margin_errors
  • usb4_port_retimer_set_inbound_sbtx
  • usb4_port_retimer_unset_inbound_sbtx
  • usb4_port_retimer_is_last
  • usb4_port_retimer_is_cable
  • usb4_port_retimer_nvm_sector_size
  • usb4_port_retimer_nvm_set_offset
  • usb4_port_retimer_nvm_write
  • usb4_port_retimer_nvm_authenticate
  • usb4_port_retimer_nvm_authenticate_status
  • usb4_port_retimer_nvm_read
  • usb4_usb3_port_max_link_rate
  • usb4_usb3_port_allocated_bandwidth
  • usb4_usb3_port_allocate_bandwidth
  • usb4_usb3_port_release_bandwidth
  • usb4_dp_port_set_cm_id
  • usb4_dp_port_bandwidth_mode_supported
  • usb4_dp_port_bandwidth_mode_enabled
  • usb4_dp_port_set_cm_bandwidth_mode_supported
  • usb4_dp_port_group_id
  • usb4_dp_port_set_group_id
  • usb4_dp_port_nrd
  • usb4_dp_port_set_nrd
  • usb4_dp_port_granularity
  • usb4_dp_port_set_granularity
  • usb4_dp_port_set_estimated_bandwidth
  • usb4_dp_port_allocated_bandwidth
  • usb4_dp_port_allocate_bandwidth
  • usb4_dp_port_requested_bandwidth
  • usb4_pci_port_set_ext_encapsulation
  • usb4_pci_port_ltssm_state
ngl, that's a lot of cross-references for a function whose whole job is "put it back." but go off, Thunderbolt subsystem. 👑

and that's the whole page, bestie 💜 — straight out of ./drivers/thunderbolt, dated October 2026, filed under the Kernel API Manual as usb4_switch..._dp_resource(9). dealloc responsibly. mwah 🎀✨

📦 where this page comes from