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

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NAMEusb_clear_halt − tells device to clear endpoint halt/stall condition

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SYNOPSISint usb_clear_halt(struct usb_device * dev, int pipe);

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ARGUMENTSdev device whose endpoint is halted pipe endpoint ‟pipe” being cleared

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CONTEXT!in_interrupt ()

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DESCRIPTIONThis is used to clear halt conditions for bulk and interrupt endpoints, as reported by URB completion status​. Endpoints that are halted are sometimes referred to as being ‟stalled”​. Such endpoints are unable to transmit or receive data until the halt status is cleared​. Any URBs queued for such an endpoint should normally be unlinked by the driver before clearing the halt condition, as described in sections 5​.7​.5 and 5​.8​.5 of the USB 2​.0 spec​. Note that control and isochronous endpoints don´t halt, although control endpoints report ‟protocol stall” (for unsupported requests) using the same status code used to report a true stall​. This call is synchronous, and may not be used in an interrupt context​. Returns zero on success, or else the status code returned by the underlying usb_control_msg call​.

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