ATA_SG_INIT(9) libata Library ATA_SG_INIT(9)NAME
ata_sg_init - Associate command with scatter-gather table.
SYNOPSIS
void ata_sg_init(struct ata_queued_cmd * qc, struct scatterlist * sg, unsigned int n_elem);
ARGUMENTS
qc
Command to be associated
sg
Scatter-gather table.
n_elem
Number of elements in s/g table.
DESCRIPTION
Initialize the data-related elements of queued_cmd qc to point to a scatter-gather table sg, containing n_elem elements.
LOCKING
spin_lock_irqsave(host lock)
AUTHOR
Jeff Garzik
Author.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 ATA_SG_INIT(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
SYNOPSIS
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);
ARGUMENTS
io
request block being initialized. until usb_sg_wait returns, treat this as a pointer to an opaque block of memory,
dev
the usb device that will send or receive the data
pipe
endpoint "pipe" used to transfer the data
period
polling rate for interrupt endpoints, in frames or (for high speed endpoints) microframes; ignored for bulk
sg
scatterlist entries
nents
how many entries in the scatterlist
length
how many bytes to send from the scatterlist, or zero to send every byte identified in the list.
mem_flags
SLAB_* flags affecting memory allocations in this call
DESCRIPTION
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)