[SCSI] mpt2sas : Device removal algorithm in interrupt context only

external host not connecting after controller reboot: The
problem is : devices are not coming back after having the cable
disconnected then reconnected. The problem is because the
driver/firmware device removal handshake is failing. Due to this failure,
the controller firmware is not sending out device add events when the target
is reconnected. This is root caused to a race in the driver/firmware device
removal algorithm. There is duplicate code in both interrupt and user
context; where target reset is being issue from user context path while
sas_iounit_control(OP_REMOVE) is being sent from interrupt context. An
active target_reset will fail the OP_REMOVE. To fix this problem, the
duplicate code has been removed from user context path.
Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/scsi/mpt2sas/mpt2sas_base.h

@@ -259,16 +259,6 @@ struct _internal_cmd {
 	u16	smid;
 };
 
-/*
- * SAS Topology Structures
- */
-
-#define MPTSAS_STATE_TR_SEND		0x0001
-#define MPTSAS_STATE_TR_COMPLETE	0x0002
-#define MPTSAS_STATE_CNTRL_SEND		0x0004
-#define MPTSAS_STATE_CNTRL_COMPLETE	0x0008
-
-#define MPT2SAS_REQ_SAS_CNTRL		0x0010
 
 /**
  * struct _sas_device - attached device information
@@ -306,7 +296,6 @@ struct _sas_device {
 	u16	slot;
 	u8	hidden_raid_component;
 	u8	responding;
-	u16	state;
 };
 
 /**