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Subject[PATCH 29/71] ncr5380: Remove references to linked commands
From: Hannes Reinecke <hare@suse.de>

Some old drivers partially implemented support for linked commands using
a "proposed" next_link pointer in struct scsi_cmnd that never actually
existed. Remove this code.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>

---

This is a modified version of Hannes' patch so I have dropped his
signed-off-by tag. This version has a rewritten commit log and also
removes additional references to linked commands from comments. This
version also omits the sun3_NCR5380.c changes since that file no
longer exists.

---
drivers/scsi/NCR5380.c | 42 ------------------------------
drivers/scsi/atari_NCR5380.c | 60 -------------------------------------------
2 files changed, 102 deletions(-)

Index: linux/drivers/scsi/NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/NCR5380.c 2015-11-18 19:33:41.000000000 +1100
+++ linux/drivers/scsi/NCR5380.c 2015-11-18 19:33:42.000000000 +1100
@@ -78,9 +78,6 @@
*
* 4. Test SCSI-II tagged queueing (I have no devices which support
* tagged queueing)
- *
- * 5. Test linked command handling code after Eric is ready with
- * the high level code.
*/
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_transport_spi.h>
@@ -94,7 +91,6 @@
#endif

#ifndef notyet
-#undef LINKED
#undef REAL_DMA
#endif

@@ -191,8 +187,6 @@
* DONT_USE_INTR - if defined, never use interrupts, even if we probe or
* override-configure an IRQ.
*
- * LINKED - if defined, linked commands are supported.
- *
* PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
*
* REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
@@ -1916,42 +1910,6 @@ static void NCR5380_information_transfer
cmd->SCp.Message = tmp;

switch (tmp) {
- /*
- * Linking lets us reduce the time required to get the
- * next command out to the device, hopefully this will
- * mean we don't waste another revolution due to the delays
- * required by ARBITRATION and another SELECTION.
- *
- * In the current implementation proposal, low level drivers
- * merely have to start the next command, pointed to by
- * next_link, done() is called as with unlinked commands.
- */
-#ifdef LINKED
- case LINKED_CMD_COMPLETE:
- case LINKED_FLG_CMD_COMPLETE:
- /* Accept message by clearing ACK */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %llu linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun);
- /*
- * Sanity check : A linked command should only terminate with
- * one of these messages if there are more linked commands
- * available.
- */
- if (!cmd->next_link) {
- printk("scsi%d : target %d lun %llu linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
- sink = 1;
- do_abort(instance);
- return;
- }
- initialize_SCp(cmd->next_link);
- /* The next command is still part of this process */
- cmd->next_link->tag = cmd->tag;
- cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
- dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %llu linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun);
- cmd->scsi_done(cmd);
- cmd = hostdata->connected;
- break;
-#endif /* def LINKED */
case ABORT:
case COMMAND_COMPLETE:
/* Accept message by clearing ACK */
Index: linux/drivers/scsi/atari_NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/atari_NCR5380.c 2015-11-18 19:33:41.000000000 +1100
+++ linux/drivers/scsi/atari_NCR5380.c 2015-11-18 19:33:42.000000000 +1100
@@ -66,12 +66,6 @@
*
*/

-/*
- * Further development / testing that should be done :
- * 1. Test linked command handling code after Eric is ready with
- * the high level code.
- */
-
/* Adapted for the sun3 by Sam Creasey. */

#include <scsi/scsi_dbg.h>
@@ -98,10 +92,6 @@
#define REMOVE(w,x,y,z)
#endif

-#ifndef notyet
-#undef LINKED
-#endif
-
/*
* Design
*
@@ -172,8 +162,6 @@
* DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
* transceivers.
*
- * LINKED - if defined, linked commands are supported.
- *
* REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
*
* SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
@@ -2210,54 +2198,6 @@ static void NCR5380_information_transfer
cmd->SCp.Message = tmp;

switch (tmp) {
- /*
- * Linking lets us reduce the time required to get the
- * next command out to the device, hopefully this will
- * mean we don't waste another revolution due to the delays
- * required by ARBITRATION and another SELECTION.
- *
- * In the current implementation proposal, low level drivers
- * merely have to start the next command, pointed to by
- * next_link, done() is called as with unlinked commands.
- */
-#ifdef LINKED
- case LINKED_CMD_COMPLETE:
- case LINKED_FLG_CMD_COMPLETE:
- /* Accept message by clearing ACK */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
-
- dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %llu linked command "
- "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
-
- /* Enable reselect interrupts */
- NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
- /*
- * Sanity check : A linked command should only terminate
- * with one of these messages if there are more linked
- * commands available.
- */
-
- if (!cmd->next_link) {
- printk(KERN_NOTICE "scsi%d: target %d lun %llu "
- "linked command complete, no next_link\n",
- HOSTNO, cmd->device->id, cmd->device->lun);
- sink = 1;
- do_abort(instance);
- return;
- }
-
- initialize_SCp(cmd->next_link);
- /* The next command is still part of this process; copy it
- * and don't free it! */
- cmd->next_link->tag = cmd->tag;
- cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
- dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %llu linked request "
- "done, calling scsi_done().\n",
- HOSTNO, cmd->device->id, cmd->device->lun);
- cmd->scsi_done(cmd);
- cmd = hostdata->connected;
- break;
-#endif /* def LINKED */
case ABORT:
case COMMAND_COMPLETE:
/* Accept message by clearing ACK */



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