USB_BUFFER_UNMAP_SG(9) USB Core APIs USB_BUFFER_UNMAP_SG(9)NAME
usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist
void usb_buffer_unmap_sg(const struct usb_device * dev, int is_in, struct scatterlist * sg, int n_hw_ents);
device to which the scatterlist will be mapped
mapping transfer direction
the scatterlist to unmap
the positive return value from usb_buffer_map_sg
Reverses the effect of usb_buffer_map_sg.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_BUFFER_UNMAP_SG(9)
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USB_SG_INIT(9) USB Core APIs USB_SG_INIT(9)NAME
usb_sg_init - initializes scatterlist-based bulk/interrupt I/O request
int usb_sg_init(struct usb_sg_request * io, struct usb_device * dev, unsigned pipe, unsigned period, struct scatterlist * sg, int nents,
size_t length, gfp_t mem_flags);
request block being initialized. until usb_sg_wait returns, treat this as a pointer to an opaque block of memory,
the usb device that will send or receive the data
endpoint "pipe" used to transfer the data
polling rate for interrupt endpoints, in frames or (for high speed endpoints) microframes; ignored for bulk
how many entries in the scatterlist
how many bytes to send from the scatterlist, or zero to send every byte identified in the list.
SLAB_* flags affecting memory allocations in this call
Returns zero for success, else a negative errno value. This initializes a scatter/gather request, allocating resources such as I/O mappings
and urb memory (except maybe memory used by USB controller drivers).
The request must be issued using usb_sg_wait, which waits for the I/O to complete (or to be canceled) and then cleans up all resources
allocated by usb_sg_init.
The request may be canceled with usb_sg_cancel, either before or after usb_sg_wait is called.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 USB_SG_INIT(9)
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