- }
- sg_page_free(schp->buffer, schp->sglist_len);
- } else if (schp->buffer)
- sg_page_free(schp->buffer, schp->b_malloc_len);
- memset(schp, 0, sizeof (*schp));
-}
-
-static int
-sg_read_xfer(Sg_request * srp)
-{
- sg_io_hdr_t *hp = &srp->header;
- Sg_scatter_hold *schp = &srp->data;
- int num_xfer = 0;
- int j, k, onum, usglen, ksglen, res;
- int iovec_count = (int) hp->iovec_count;
- int dxfer_dir = hp->dxfer_direction;
- unsigned char *p;
- unsigned char __user *up;
- int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
-
- if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
- || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
- num_xfer = hp->dxfer_len;
- if (schp->bufflen < num_xfer)
- num_xfer = schp->bufflen;
- }
- if ((num_xfer <= 0) || (schp->dio_in_use) ||
- (new_interface
- && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
- return 0;
-
- SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
- num_xfer, iovec_count, schp->k_use_sg));
- if (iovec_count) {
- onum = iovec_count;
- if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
- return -EFAULT;
- } else
- onum = 1;
-
- if (0 == schp->k_use_sg) { /* kernel has single buffer */
- for (j = 0, p = schp->buffer; j < onum; ++j) {
- res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
- if (res)
- return res;
- usglen = (num_xfer > usglen) ? usglen : num_xfer;
- if (__copy_to_user(up, p, usglen))
- return -EFAULT;
- p += usglen;
- num_xfer -= usglen;
- if (num_xfer <= 0)
- return 0;
- }
- } else { /* kernel using scatter gather list */
- struct scatterlist *sclp = (struct scatterlist *) schp->buffer;