[SCSI] Let scsi_cmnd->cmnd use request->cmd buffer

 - struct scsi_cmnd had a 16 bytes command buffer of its own.
   This is an unnecessary duplication and copy of request's
   cmd. It is probably left overs from the time that scsi_cmnd
   could function without a request attached. So clean that up.

 - Once above is done, few places, apart from scsi-ml, needed
   adjustments due to changing the data type of scsi_cmnd->cmnd.

 - Lots of drivers still use MAX_COMMAND_SIZE. So I have left
   that #define but equate it to BLK_MAX_CDB. The way I see it
   and is reflected in the patch below is.
   MAX_COMMAND_SIZE - means: The longest fixed-length (*) SCSI CDB
                      as per the SCSI standard and is not related
                      to the implementation.
   BLK_MAX_CDB.     - The allocated space at the request level

 - I have audit all ISA drivers and made sure none use ->cmnd in a DMA
   Operation. Same audit was done by Andi Kleen.

(*)fixed-length here means commands that their size can be determined
   by their opcode and the CDB does not carry a length specifier, (unlike
   the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
   true and the SCSI standard also defines extended commands and
   vendor specific commands that can be bigger than 16 bytes. The kernel
   will support these using the same infrastructure used for VARLEN CDB's.
   So in effect MAX_COMMAND_SIZE means the maximum size command
   scsi-ml supports without specifying a cmd_len by ULD's

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

10 files changed, 25 insertions, 21 deletions

diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c
index f4c4fe9..f5a9add 100644
--- a/drivers/scsi/53c700.c
+++ b/drivers/scsi/53c700.c
@@ -599,7 +599,7 @@ NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
 			(struct NCR_700_command_slot *)SCp->host_scribble;
 		
 		dma_unmap_single(hostdata->dev, slot->pCmd,
-				 sizeof(SCp->cmnd), DMA_TO_DEVICE);
+				 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
 		if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
 			char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
 #ifdef NCR_700_DEBUG
@@ -1004,7 +1004,7 @@ process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 				 * here */
 				NCR_700_unmap(hostdata, SCp, slot);
 				dma_unmap_single(hostdata->dev, slot->pCmd,
-						 sizeof(SCp->cmnd),
+						 MAX_COMMAND_SIZE,
 						 DMA_TO_DEVICE);
 
 				cmnd[0] = REQUEST_SENSE;
@@ -1901,7 +1901,7 @@ NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
 	}
 	slot->resume_offset = 0;
 	slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
-				    sizeof(SCp->cmnd), DMA_TO_DEVICE);
+				    MAX_COMMAND_SIZE, DMA_TO_DEVICE);
 	NCR_700_start_command(SCp);
 	return 0;
 }
diff --git a/drivers/scsi/a100u2w.c b/drivers/scsi/a100u2w.c
index 792b2e8..ced3eeb 100644
--- a/drivers/scsi/a100u2w.c
+++ b/drivers/scsi/a100u2w.c
@@ -895,7 +895,7 @@ static void inia100_build_scb(struct orc_host * host, struct orc_scb * scb, stru
 	} else {
 		scb->tag_msg = 0;	/* No tag support               */
 	}
-	memcpy(&scb->cdb[0], &cmd->cmnd, scb->cdb_len);
+	memcpy(scb->cdb, cmd->cmnd, scb->cdb_len);
 }
 
 /**
diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index c6d6e7c..8e2e964 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -465,7 +465,7 @@ int __gdth_execute(struct scsi_device *sdev, gdth_cmd_str *gdtcmd, char *cmnd,
     scp->request = (struct request *)&wait;
     scp->timeout_per_command = timeout*HZ;
     scp->cmd_len = 12;
-    memcpy(scp->cmnd, cmnd, 12);
+    scp->cmnd = cmnd;
     cmndinfo.priority = IOCTL_PRI;
     cmndinfo.internal_cmd_str = gdtcmd;
     cmndinfo.internal_command = 1;
diff --git a/drivers/scsi/hptiop.c b/drivers/scsi/hptiop.c
index 5b7be1e..aaa48e0 100644
--- a/drivers/scsi/hptiop.c
+++ b/drivers/scsi/hptiop.c
@@ -763,9 +763,9 @@ static int hptiop_queuecommand(struct scsi_cmnd *scp,
 			scp,
 			host->host_no, scp->device->channel,
 			scp->device->id, scp->device->lun,
-			*((u32 *)&scp->cmnd),
-			*((u32 *)&scp->cmnd + 1),
-			*((u32 *)&scp->cmnd + 2),
+			((u32 *)scp->cmnd)[0],
+			((u32 *)scp->cmnd)[1],
+			((u32 *)scp->cmnd)[2],
 			_req->index, _req->req_virt);
 
 	scp->result = 0;
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 9c77015..ccfd8ac 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -739,7 +739,7 @@ static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd,
 	srp_cmd = &evt_struct->iu.srp.cmd;
 	memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
 	srp_cmd->opcode = SRP_CMD;
-	memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd));
+	memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
 	srp_cmd->lun = ((u64) lun) << 48;
 
 	if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
diff --git a/drivers/scsi/initio.c b/drivers/scsi/initio.c
index dbae3fd..e3f7397 100644
--- a/drivers/scsi/initio.c
+++ b/drivers/scsi/initio.c
@@ -2590,7 +2590,7 @@ static void initio_build_scb(struct initio_host * host, struct scsi_ctrl_blk * c
 	cblk->hastat = 0;
 	cblk->tastat = 0;
 	/* Command the command */
-	memcpy(&cblk->cdb[0], &cmnd->cmnd, cmnd->cmd_len);
+	memcpy(cblk->cdb, cmnd->cmnd, cmnd->cmd_len);
 
 	/* Set up tags */
 	if (cmnd->device->tagged_supported) {	/* Tag Support                  */
diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 09ab3ea..fa06093 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -2858,7 +2858,7 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 
 	/* Load SCSI command packet. */
 	pkt->cdb_len = cpu_to_le16(CMD_CDBLEN(cmd));
-	memcpy(pkt->scsi_cdb, &(CMD_CDBP(cmd)), CMD_CDBLEN(cmd));
+	memcpy(pkt->scsi_cdb, CMD_CDBP(cmd), CMD_CDBLEN(cmd));
 	/* dprintk(1, "Build packet for command[0]=0x%x\n",pkt->scsi_cdb[0]); */
 
 	/* Set transfer direction. */
@@ -3127,7 +3127,7 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 
 	/* Load SCSI command packet. */
 	pkt->cdb_len = cpu_to_le16(CMD_CDBLEN(cmd));
-	memcpy(pkt->scsi_cdb, &(CMD_CDBP(cmd)), CMD_CDBLEN(cmd));
+	memcpy(pkt->scsi_cdb, CMD_CDBP(cmd), CMD_CDBLEN(cmd));
 
 	/*dprintk(1, "Build packet for command[0]=0x%x\n",pkt->scsi_cdb[0]); */
 	/* Set transfer direction. */
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 221f31e..334244c 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -626,7 +626,7 @@ static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd)
  * @scmd:       SCSI command structure to hijack
  * @ses:        structure to save restore information
  * @cmnd:       CDB to send. Can be NULL if no new cmnd is needed
- * @cmnd_size:  size in bytes of @cmnd
+ * @cmnd_size:  size in bytes of @cmnd (must be <= BLK_MAX_CDB)
  * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored)
  *
  * This function is used to save a scsi command information before re-execution
@@ -648,12 +648,14 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
 	 * command.
 	 */
 	ses->cmd_len = scmd->cmd_len;
-	memcpy(ses->cmnd, scmd->cmnd, sizeof(scmd->cmnd));
+	ses->cmnd = scmd->cmnd;
 	ses->data_direction = scmd->sc_data_direction;
 	ses->sdb = scmd->sdb;
 	ses->next_rq = scmd->request->next_rq;
 	ses->result = scmd->result;
 
+	scmd->cmnd = ses->eh_cmnd;
+	memset(scmd->cmnd, 0, BLK_MAX_CDB);
 	memset(&scmd->sdb, 0, sizeof(scmd->sdb));
 	scmd->request->next_rq = NULL;
 
@@ -665,14 +667,13 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
 		scmd->sdb.table.sgl = &ses->sense_sgl;
 		scmd->sc_data_direction = DMA_FROM_DEVICE;
 		scmd->sdb.table.nents = 1;
-		memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
 		scmd->cmnd[0] = REQUEST_SENSE;
 		scmd->cmnd[4] = scmd->sdb.length;
 		scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
 	} else {
 		scmd->sc_data_direction = DMA_NONE;
 		if (cmnd) {
-			memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
+			BUG_ON(cmnd_size > BLK_MAX_CDB);
 			memcpy(scmd->cmnd, cmnd, cmnd_size);
 			scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
 		}
@@ -705,7 +706,7 @@ void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses)
 	 * Restore original data
 	 */
 	scmd->cmd_len = ses->cmd_len;
-	memcpy(scmd->cmnd, ses->cmnd, sizeof(scmd->cmnd));
+	scmd->cmnd = ses->cmnd;
 	scmd->sc_data_direction = ses->data_direction;
 	scmd->sdb = ses->sdb;
 	scmd->request->next_rq = ses->next_rq;
@@ -1774,8 +1775,8 @@ scsi_reset_provider(struct scsi_device *dev, int flag)
 	scmd->request = &req;
 	memset(&scmd->eh_timeout, 0, sizeof(scmd->eh_timeout));
 
-	memset(&scmd->cmnd, '\0', sizeof(scmd->cmnd));
-    
+	scmd->cmnd = req.cmd;
+
 	scmd->scsi_done		= scsi_reset_provider_done_command;
 	memset(&scmd->sdb, 0, sizeof(scmd->sdb));
 
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 67f412b..325270b 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1090,6 +1090,8 @@ static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev,
 	cmd->tag = req->tag;
 	cmd->request = req;
 
+	cmd->cmnd = req->cmd;
+
 	return cmd;
 }
 
@@ -1127,8 +1129,6 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
 		req->buffer = NULL;
 	}
 
-	BUILD_BUG_ON(sizeof(req->cmd) > sizeof(cmd->cmnd));
-	memcpy(cmd->cmnd, req->cmd, sizeof(cmd->cmnd));
 	cmd->cmd_len = req->cmd_len;
 	if (!req->data_len)
 		cmd->sc_data_direction = DMA_NONE;
@@ -1165,6 +1165,7 @@ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
 	if (unlikely(!cmd))
 		return BLKPREP_DEFER;
 
+	memset(cmd->cmnd, 0, BLK_MAX_CDB);
 	return scsi_init_io(cmd, GFP_ATOMIC);
 }
 EXPORT_SYMBOL(scsi_setup_fs_cmnd);
diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c
index ee8496a..257e097 100644
--- a/drivers/scsi/scsi_tgt_lib.c
+++ b/drivers/scsi/scsi_tgt_lib.c
@@ -107,6 +107,8 @@ struct scsi_cmnd *scsi_host_get_command(struct Scsi_Host *shost,
 	cmd->jiffies_at_alloc = jiffies;
 	cmd->request = rq;
 
+	cmd->cmnd = rq->cmd;
+
 	rq->special = cmd;
 	rq->cmd_type = REQ_TYPE_SPECIAL;
 	rq->cmd_flags |= REQ_TYPE_BLOCK_PC;