scsi: mesh: Move the SCSI pointer to private command data

Set .cmd_size in the SCSI host template instead of using the SCSI pointer
from struct scsi_cmnd. This patch prepares for removal of the SCSI pointer
from struct scsi_cmnd.

Link: https://lore.kernel.org/r/20220218195117.25689-35-bvanassche@acm.org
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/mesh.c b/drivers/scsi/mesh.c
index ca133e0..de9ae36 100644 (file)
--- a/drivers/scsi/mesh.c
+++ b/drivers/scsi/mesh.c
@@ -586,10 +586,12 @@ static void mesh_done(struct mesh_state *ms, int start_next)
        ms->current_req = NULL;
        tp->current_req = NULL;
        if (cmd) {
+               struct scsi_pointer *scsi_pointer = mesh_scsi_pointer(cmd);
+
                set_host_byte(cmd, ms->stat);
-               set_status_byte(cmd, cmd->SCp.Status);
+               set_status_byte(cmd, scsi_pointer->Status);
                if (ms->stat == DID_OK)
-                       scsi_msg_to_host_byte(cmd, cmd->SCp.Message);
+                       scsi_msg_to_host_byte(cmd, scsi_pointer->Message);
                if (DEBUG_TARGET(cmd)) {
                        printk(KERN_DEBUG "mesh_done: result = %x, data_ptr=%d, buflen=%d\n",
                               cmd->result, ms->data_ptr, scsi_bufflen(cmd));
@@ -603,7 +605,7 @@ static void mesh_done(struct mesh_state *ms, int start_next)
                        }
 #endif
                }
-               cmd->SCp.this_residual -= ms->data_ptr;
+               scsi_pointer->this_residual -= ms->data_ptr;
                scsi_done(cmd);
        }
        if (start_next) {
@@ -1171,7 +1173,7 @@ static void handle_msgin(struct mesh_state *ms)
        if (ms->n_msgin < msgin_length(ms))
                goto reject;
        if (cmd)
-               cmd->SCp.Message = code;
+               mesh_scsi_pointer(cmd)->Message = code;
        switch (code) {
        case COMMAND_COMPLETE:
                break;
@@ -1262,7 +1264,7 @@ static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd)
        if (cmd) {
                int nseg;
 
-               cmd->SCp.this_residual = scsi_bufflen(cmd);
+               mesh_scsi_pointer(cmd)->this_residual = scsi_bufflen(cmd);
 
                nseg = scsi_dma_map(cmd);
                BUG_ON(nseg < 0);
@@ -1592,10 +1594,13 @@ static void cmd_complete(struct mesh_state *ms)
                        break;
                case statusing:
                        if (cmd) {
-                               cmd->SCp.Status = mr->fifo;
+                               struct scsi_pointer *scsi_pointer =
+                                       mesh_scsi_pointer(cmd);
+
+                               scsi_pointer->Status = mr->fifo;
                                if (DEBUG_TARGET(cmd))
                                        printk(KERN_DEBUG "mesh: status is %x\n",
-                                              cmd->SCp.Status);
+                                              scsi_pointer->Status);
                        }
                        ms->msgphase = msg_in;
                        break;
@@ -1837,6 +1842,7 @@ static struct scsi_host_template mesh_template = {
        .sg_tablesize                   = SG_ALL,
        .cmd_per_lun                    = 2,
        .max_segment_size               = 65535,
+       .cmd_size                       = sizeof(struct mesh_cmd_priv),
 };
 
 static int mesh_probe(struct macio_dev *mdev, const struct of_device_id *match)

diff --git a/drivers/scsi/mesh.h b/drivers/scsi/mesh.h
index ee53c05..1afa8b3 100644 (file)
--- a/drivers/scsi/mesh.h
+++ b/drivers/scsi/mesh.h
@@ -8,6 +8,17 @@
 #ifndef _MESH_H
 #define _MESH_H
 
+struct mesh_cmd_priv {
+       struct scsi_pointer scsi_pointer;
+};
+
+static inline struct scsi_pointer *mesh_scsi_pointer(struct scsi_cmnd *cmd)
+{
+       struct mesh_cmd_priv *mcmd = scsi_cmd_priv(cmd);
+
+       return &mcmd->scsi_pointer;
+}
+
 /*
  * Registers in the MESH controller.
  */