ata_sg_init — Associate command with scatter-gather table.
void ata_sg_init
(struct ata_queued_cmd * qc, struct scatterlist * sg, unsigned int n_elem);
Command to be associated
Scatter-gather table.
Number of elements in s/g table.
Initialize the data-related elements of queued_cmd qc to point to a scatter-gather table sg, containing n_elem elements.
spin_lock_irqsave(host lock)