hpsa controller driver hangs in error handling stage.

Issue

• hpsa controller driver error handler hangs while resetting the device.
  • hpsa controller was seen in RECOVERY state in case of inbuilt hpsa controller.

host0    hpsa                             0xFFFF88145B5D6800 0xFFFF88145B5D6BA0 - 0x0000000000000000 0xFFFF88145B5D6DE0 0xFFFF88145DE88000
shost_state         :  <5> SHOST_RECOVERY                                                    <----------------
  host_busy         :       8           ; commands actually active on low-level device
  host_failed       :       8           ; commands that failed (in above count)
  host_eh_scheduled :       0           ; EH scheduled without command
  resetting         :      -1           ; if set, last_reset is a valid value
  last_reset        :  0000000000000000 ; jiffies?
  host_self_blocked :       0           ; Host has requested no further requests come thru for now
  host_blocked      :       0           ; Host has rejected a command because it was busy
  max_host_blocked  :       7           ; Value host_block counts down from
  tmf_in_progress   :       0           ; task management function in progress, typ. due to recovery
  async_scan        :       0           ; async scan in progress

• Devices were taken offline after messages 'Controller lockup detected: 0xffff0000 after 30' in case of third party driver.

EXT4-fs (dm-16): mounted filesystem with ordered data mode. Opts: 
EXT4-fs (dm-17): mounted filesystem with ordered data mode. Opts: 
levelhpsa 0000:08:00.0:     logical_reset scsi 0:1:0:0: Direct-Access     HP       LOGICAL VOLUME   RAID-1(1+0) SSDSmartPathCap- En- Exp=1 qd=1024
hpsa 0000:08:00.0: Controller lockup detected: 0xffff0000 after 30    <-------------
hpsa 0000:08:00.0: Telling controller to do an NMI
hpsa 0000:08:00.0: controller lockup detected: NULL_SDEV_PTR TAG:0x00000000:00003680 LUN:0000004000000000 CDB:01040000000000000000000000000000
hpsa 0000:08:00.0: failed 218 commands in fail_all
hpsa 0000:08:00.0: Controller Lockup detected, controller disabled.
hpsa 0000:08:00.0: resetting scsi 0:1:0:0 failed
hpsa 0000:08:00.0: scsi 0:1:0:1 RESET FAILED, lockup detected
sd 0:1:0:0: Device offlined - not ready after error recovery  <--------- devices attached to hpsa controller were taken offline
sd 0:1:0:0: Device offlined - not ready after error recovery
sd 0:1:0:0: Device offlined - not ready after error recovery
[.... ]

sd 0:1:0:0: rejecting I/O to offline device
sd 0:1:0:0: rejecting I/O to offline device

[.... ]

Buffer I/O error on device dm-1, logical block 19931710  
lost page write due to I/O error on dm-1          <---- filesystems went to read-only mode
sd 0:1:0:1: rejecting I/O to offline device
Buffer I/O error on device dm-1, logical block 20447266
lost page write due to I/O error on dm-1
sd 0:1:0:1: rejecting I/O to offline device
Buffer I/O error on device dm-1, logical block 20447270