usb_hub_clear_tt_buffer(9)

✨ usb_hub_clear_tt_buffer(9) — clearing the TT vibe check ✨

okay so picture this: it's a Linux kernel API manual page, right, and it's lowkey about the glow-up of a transaction translator (TT) after a split transaction has a whole meltdown. bestie, this is the function you call when the high speed hub needs to, like, reset its internal state. it's giving "clean up on aisle TT." 💅

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🦋 NAME 🦋

usb_hub_clear_tt_buffer — clear control/bulk TT state in high speed hub

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🎀 SYNOPSIS 🎀

int usb_hub_clear_tt_buffer (struct urb *urb );

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🌸 ARGUMENTS 🌸

• urb — an URB associated with the failed or incomplete split transaction. yeah, that one. the messy one. the one that didn't eat. 🫶

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💖 DESCRIPTION 💖

so high speed HCDs use this little icon to tell the hub driver that some split control or bulk transaction failed in a way that requires clearing internal state of a transaction translator. it's like when your fave group chat gets so chaotic you just have to clear the cache and start fresh, no cap. 🧚

and when does this usually get detected? from interrupt context. yes bestie, interrupt context. she's reporting her own drama in real time. 😭

here's the tea though: it may not be possible for that hub to handle additional full (or low) speed transactions until that state is fully cleared out. so like, the hub is lowkey out of commission until the clean-up happens. no rush, but also... rush. 🔥

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⭐ RETURN ⭐

• 0 if successful. slay. 💅
• a negative error code otherwise. and that's the vibe check failing. 💀

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🌈 SEE ALSO 🌈

kernel file ./drivers/usb/core/hub.c and honestly the whole friend group:

• usb_hub_set_port_power(9)
• usb_remove_device(9)
• usb_set_device_state(9)
• usb_disconnect(9)
• usb_enumerate_device_otg(9)
• usb_enumerate_device(9)
• usb_new_device(9)
• usb_deauthorize_device(9)
• get_port_ssp_rate(9)
• usb_root_hub_lost_power(9)
• hub_hc_release_resources(9)
• usb_reset_and_verify_device(9)
• usb_reset_device(9)
• usb_queue_reset_device(9)
• usb_hub_find_child(9)
• usb_get_hub_port_acpi_handle(9)

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okay that's the whole page, bestie. this iconic little function lives under the source/version ./drivers/usb/core, October 2026, and it's fr fr here to keep your high speed hub from having a main character meltdown. 💜✨ 🎀