[SCSI] mesh: convert to use the data buffer accessors

- remove the unnecessary map_single path.

- convert to use the new accessors for the sg lists and the
parameters.

Jens Axboe <jens.axboe@oracle.com> did the for_each_sg cleanup.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 19 insertions, 27 deletions

diff --git a/drivers/scsi/mesh.c b/drivers/scsi/mesh.c
index e64d1a19d8d7..651d09b08f2a 100644
--- a/drivers/scsi/mesh.c
+++ b/drivers/scsi/mesh.c
@@ -421,7 +421,7 @@ static void mesh_start_cmd(struct mesh_state *ms, struct scsi_cmnd *cmd)
                 for (i = 0; i < cmd->cmd_len; ++i)
                         printk(" %x", cmd->cmnd[i]);
                 printk(" use_sg=%d buffer=%p bufflen=%u\n",
-                       cmd->use_sg, cmd->request_buffer, cmd->request_bufflen);
+                       scsi_sg_count(cmd), scsi_sglist(cmd), scsi_bufflen(cmd));
         }
 #endif
         if (ms->dma_started)
@@ -602,13 +602,16 @@ static void mesh_done(struct mesh_state *ms, int start_next)
                         cmd->result += (cmd->SCp.Message << 8);
                 if (DEBUG_TARGET(cmd)) {
                         printk(KERN_DEBUG "mesh_done: result = %x, data_ptr=%d, buflen=%d\n",
-                               cmd->result, ms->data_ptr, cmd->request_bufflen);
+                               cmd->result, ms->data_ptr, scsi_bufflen(cmd));
+#if 0
+                        /* needs to use sg? */
                         if ((cmd->cmnd[0] == 0 || cmd->cmnd[0] == 0x12 || cmd->cmnd[0] == 3)
                             && cmd->request_buffer != 0) {
                                 unsigned char *b = cmd->request_buffer;
                                 printk(KERN_DEBUG "buffer = %x %x %x %x %x %x %x %x\n",
                                        b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
                         }
+#endif
                 }
                 cmd->SCp.this_residual -= ms->data_ptr;
                 mesh_completed(ms, cmd);
@@ -1265,15 +1268,18 @@ static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd)
         dcmds = ms->dma_cmds;
         dtot = 0;
         if (cmd) {
-                cmd->SCp.this_residual = cmd->request_bufflen;
-                if (cmd->use_sg > 0) {
-                        int nseg;
+                int nseg;
+
+                cmd->SCp.this_residual = scsi_bufflen(cmd);
+
+                nseg = scsi_dma_map(cmd);
+                BUG_ON(nseg < 0);
+
+                if (nseg) {
                         total = 0;
-                        scl = (struct scatterlist *) cmd->request_buffer;
                         off = ms->data_ptr;
-                        nseg = pci_map_sg(ms->pdev, scl, cmd->use_sg,
-                                          cmd->sc_data_direction);
-                        for (i = 0; i <nseg; ++i, ++scl) {
+
+                        scsi_for_each_sg(cmd, scl, nseg, i) {
                                 u32 dma_addr = sg_dma_address(scl);
                                 u32 dma_len = sg_dma_len(scl);
                                 
@@ -1292,16 +1298,6 @@ static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd)
                                 dtot += dma_len - off;
                                 off = 0;
                         }
-                } else if (ms->data_ptr < cmd->request_bufflen) {
-                        dtot = cmd->request_bufflen - ms->data_ptr;
-                        if (dtot > 0xffff)
-                                panic("mesh: transfer size >= 64k");
-                        st_le16(&dcmds->req_count, dtot);
-                        /* XXX Use pci DMA API here ... */
-                        st_le32(&dcmds->phy_addr,
-                                virt_to_phys(cmd->request_buffer) + ms->data_ptr);
-                        dcmds->xfer_status = 0;
-                        ++dcmds;
                 }
         }
         if (dtot == 0) {
@@ -1356,18 +1352,14 @@ static void halt_dma(struct mesh_state *ms)
                 dumplog(ms, ms->conn_tgt);
                 dumpslog(ms);
 #endif /* MESH_DBG */
-        } else if (cmd && cmd->request_bufflen != 0 &&
-                   ms->data_ptr > cmd->request_bufflen) {
+        } else if (cmd && scsi_bufflen(cmd) &&
+                   ms->data_ptr > scsi_bufflen(cmd)) {
                 printk(KERN_DEBUG "mesh: target %d overrun, "
                        "data_ptr=%x total=%x goes_out=%d\n",
-                       ms->conn_tgt, ms->data_ptr, cmd->request_bufflen,
+                       ms->conn_tgt, ms->data_ptr, scsi_bufflen(cmd),
                        ms->tgts[ms->conn_tgt].data_goes_out);
         }
-        if (cmd->use_sg != 0) {
-                struct scatterlist *sg;
-                sg = (struct scatterlist *)cmd->request_buffer;
-                pci_unmap_sg(ms->pdev, sg, cmd->use_sg, cmd->sc_data_direction);
-        }
+        scsi_dma_unmap(cmd);
         ms->dma_started = 0;
 }