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

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NAMEusb_poison_urb − reliably kill a transfer and prevent further use of an URB

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SYNOPSISvoid usb_poison_urb(struct urb * urb);

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ARGUMENTSurb pointer to URB describing a previously submitted request, may be NULL

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DESCRIPTIONThis routine cancels an in−progress request​. It is guaranteed that upon return all completion handlers will have finished and the URB will be totally idle and cannot be reused​. These features make this an ideal way to stop I/O in a disconnect callback​. If the request has not already finished or been unlinked the completion handler will see urb−>status == −ENOENT​. After and while the routine runs, attempts to resubmit the URB will fail with error −EPERM​. Thus even if the URB´s completion handler always tries to resubmit, it will not succeed and the URB will become idle​. This routine may not be used in an interrupt context (such as a bottom half or a completion handler), or when holding a spinlock, or in other situations where the caller can´t schedule​. This routine should not be called by a driver after its disconnect method has returned​.

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