qc->scsidone = done;
if (cmd->use_sg) {
- qc->sg = (struct scatterlist *) cmd->request_buffer;
+ qc->__sg = (struct scatterlist *) cmd->request_buffer;
qc->n_elem = cmd->use_sg;
} else {
- qc->sg = &qc->sgent;
+ qc->__sg = &qc->sgent;
qc->n_elem = 1;
}
} else {
*/
blk_queue_max_sectors(sdev->request_queue, 2048);
}
+
+ /*
+ * SATA DMA transfers must be multiples of 4 byte, so
+ * we need to pad ATAPI transfers using an extra sg.
+ * Decrement max hw segments accordingly.
+ */
+ if (dev->class == ATA_DEV_ATAPI) {
+ request_queue_t *q = sdev->request_queue;
+ blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
+ }
}
return 0; /* scsi layer doesn't check return value, sigh */