USB_HUB_CLEAR_TT_BUF - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : USB Core APIs

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NAMEusb_hub_clear_tt_buffer − clear control/bulk TT state in high speed hub

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SYNOPSISint usb_hub_clear_tt_buffer(struct urb * urb);

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ARGUMENTSurb an URB associated with the failed or incomplete split transaction

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DESCRIPTIONHigh speed HCDs use this 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​. This is normally detected (and reported) from interrupt context​. It may not be possible for that hub to handle additional full (or low) speed transactions until that state is fully cleared out​.

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