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usb_poison_anchored_urbs(9) [centos man page]

USB_POISON_ANCHORED_(9) 					   USB Core APIs					   USB_POISON_ANCHORED_(9)

NAME
usb_poison_anchored_urbs - cease all traffic from an anchor SYNOPSIS
void usb_poison_anchored_urbs(struct usb_anchor * anchor); ARGUMENTS
anchor anchor the requests are bound to DESCRIPTION
this allows all outstanding URBs to be poisoned starting from the back of the queue. Newly added URBs will also be poisoned This routine should not be called by a driver after its disconnect method has returned. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 USB_POISON_ANCHORED_(9)

Check Out this Related Man Page

USB_BUFFER_MAP_SG(9)						   USB Core APIs					      USB_BUFFER_MAP_SG(9)

NAME
usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint SYNOPSIS
int usb_buffer_map_sg(const struct usb_device * dev, int is_in, struct scatterlist * sg, int nents); ARGUMENTS
dev device to which the scatterlist will be mapped is_in mapping transfer direction sg the scatterlist to map nents the number of entries in the scatterlist DESCRIPTION
Return value is either < 0 (indicating no buffers could be mapped), or the number of DMA mapping array entries in the scatterlist. The caller is responsible for placing the resulting DMA addresses from the scatterlist into URB transfer buffer pointers, and for setting the URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs. Top I/O rates come from queuing URBs, instead of waiting for each one to complete before starting the next I/O. This is particularly easy to do with scatterlists. Just allocate and submit one URB for each DMA mapping entry returned, stopping on the first error or when all succeed. Better yet, use the usb_sg_*() calls, which do that (and more) for you. This call would normally be used when translating scatterlist requests, rather than usb_buffer_map, since on some hardware (with IOMMUs) it may be able to coalesce mappings for improved I/O efficiency. Reverse the effect of this call with usb_buffer_unmap_sg. COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 USB_BUFFER_MAP_SG(9)

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