scsi: megaraid: Pass in NULL scb for host reset

When calling a host reset we shouldn't rely on the command triggering the
reset, so allow megaraid_abort_and_reset() to be called with a NULL scb.
And drop the pointless 'bus_reset' and 'target_reset' handlers, which just
call the same function as host_reset.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20231002154328.43718-12-hare@suse.deReviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/megaraid.c

@@ -1898,7 +1898,7 @@ megaraid_reset(struct scsi_cmnd *cmd)
 
 	spin_lock_irq(&adapter->lock);
 
-	rval =  megaraid_abort_and_reset(adapter, cmd, SCB_RESET);
+	rval =  megaraid_abort_and_reset(adapter, NULL, SCB_RESET);
 
 	/*
 	 * This is required here to complete any completed requests
@@ -1937,7 +1937,7 @@ megaraid_abort_and_reset(adapter_t *adapter, struct scsi_cmnd *cmd, int aor)
 
 		scb = list_entry(pos, scb_t, list);
 
-		if (scb->cmd == cmd) { /* Found command */
+		if (!cmd || scb->cmd == cmd) { /* Found command */
 
 			scb->state |= aor;
 
@@ -1956,33 +1956,25 @@ megaraid_abort_and_reset(adapter_t *adapter, struct scsi_cmnd *cmd, int aor)
 
 				return FAILED;
 			}
-			else {
-
 			/*
 			 * Not yet issued! Remove from the pending
 			 * list
 			 */
 			dev_warn(&adapter->dev->dev,
 				 "%s-[%x], driver owner\n",
-					(aor==SCB_ABORT) ? "ABORTING":"RESET",
+				 (cmd) ? "ABORTING":"RESET",
 				 scb->idx);
-
 			mega_free_scb(adapter, scb);
 
-				if( aor == SCB_ABORT ) {
+			if (cmd) {
 				cmd->result = (DID_ABORT << 16);
-				}
-				else {
-					cmd->result = (DID_RESET << 16);
-				}
-
 				list_add_tail(SCSI_LIST(cmd),
 					      &adapter->completed_list);
+			}
 
 			return SUCCESS;
 		}
 	}
-	}
 
 	return FAILED;
 }
@@ -4114,8 +4106,6 @@ static const struct scsi_host_template megaraid_template = {
 	.sg_tablesize			= MAX_SGLIST,
 	.cmd_per_lun			= DEF_CMD_PER_LUN,
 	.eh_abort_handler		= megaraid_abort,
-	.eh_device_reset_handler	= megaraid_reset,
-	.eh_bus_reset_handler		= megaraid_reset,
 	.eh_host_reset_handler		= megaraid_reset,
 	.no_write_same			= 1,
 	.cmd_size			= sizeof(struct megaraid_cmd_priv),