System hang caused by workqueue stall in qla2xxx driver

Issue

• System hang caused by workqueue stall in qla2xxx driver:

PID: 1162   TASK: ffff9ac326995c40  CPU: 37  COMMAND: "scsi_eh_16"
 #0 [ffffb9a01ae1bb78] __schedule at ffffffff864d1826
 #1 [ffffb9a01ae1bc10] schedule at ffffffff864d1cb8
 #2 [ffffb9a01ae1bc20] schedule_timeout at ffffffff864d58d6
 #3 [ffffb9a01ae1bcb8] wait_for_completion at ffffffff864d271f
 #4 [ffffb9a01ae1bd18] flush_workqueue at ffffffff85cd202d
 #5 [ffffb9a01ae1bdb8] qla2xxx_eh_host_reset at ffffffffc0ae66ed [qla2xxx]
 #6 [ffffb9a01ae1bdf0] scsi_try_host_reset at ffffffff861d407a
 #7 [ffffb9a01ae1be18] scsi_eh_ready_devs at ffffffff861d5a4c
 #8 [ffffb9a01ae1be98] scsi_error_handler at ffffffff861d75b9
 #9 [ffffb9a01ae1bf10] kthread at ffffffff85cd9502
#10 [ffffb9a01ae1bf50] ret_from_fork at ffffffff8660023f