scsi: pm80xx: Make mpi_build_cmd locking consistent

scsi: pm80xx: Make mpi_build_cmd locking consistent

Driver submits all internal requests (like abort_task, event acknowledgment
etc.) through inbound queue 0. While submitting those, driver does not
acquire any lock and this may lead to a race when there is an I/O request
coming in on CPU0 and submitted through inbound queue 0.  To avoid this,
lock acquisition has been moved to pm8001_mpi_build_cmd().  All command
submission will go through this path.

Link: https://lore.kernel.org/r/20201102165528.26510-2-Viswas.G@microchip.com.com
Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: peter chang <dpf@google.com>
Signed-off-by: Viswas G <Viswas.G@microchip.com>
Signed-off-by: Ruksar Devadi <Ruksar.devadi@microchip.com>
Signed-off-by: Radha Ramachandran <radha@google.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>