"iommu/vt-d: Delegate DMA domain to generic iommu" series breaks megaraid_sas

[Qian Cai]

The linux-next series "iommu/vt-d: Delegate DMA domain to generic iommu" [1]
causes a system with the rootfs on megaraid_sas card unable to boot.

Reverted the whole series on the top of linux-next (next-20190607) fixed the
issue.

The information regards this storage card is,

[ÂÂ116.466810][ÂÂT324] megaraid_sas 0000:06:00.0: FW provided supportMaxExtLDs:
0	max_lds: 32
[ÂÂ116.476052][ÂÂT324] megaraid_sas 0000:06:00.0: controller type	:
iMR(0MB)
[ÂÂ116.483646][ÂÂT324] megaraid_sas 0000:06:00.0: Online Controller Reset(OCR)	
: Enabled
[ÂÂ116.492403][ÂÂT324] megaraid_sas 0000:06:00.0: Secure JBOD support	:
Yes
[ÂÂ116.499887][ÂÂT324] megaraid_sas 0000:06:00.0: NVMe passthru support	:
No
[ÂÂ116.507480][ÂÂT324] megaraid_sas 0000:06:00.0: FW provided
[ÂÂ116.612523][ÂÂT324] megaraid_sas 0000:06:00.0: NVME page size	: (0)
[ÂÂ116.629991][ÂÂT324] megaraid_sas 0000:06:00.0: INIT adapter done
[ÂÂ116.714789][ÂÂT324] megaraid_sas 0000:06:00.0: pci id		:
(0x1000)/(0x0017)/(0x1d49)/(0x0500)
[ÂÂ116.724228][ÂÂT324] megaraid_sas 0000:06:00.0: unevenspan support	: no
[ÂÂ116.731518][ÂÂT324] megaraid_sas 0000:06:00.0: firmware crash dump	:
no
[ÂÂ116.738981][ÂÂT324] megaraid_sas 0000:06:00.0: jbod sync map		:
yes
[ÂÂ116.787433][ÂÂT324] scsi host0: Avago SAS based MegaRAID driver
[ÂÂ117.081088][ÂÂT324] scsi 0:0:0:0: Direct-
AccessÂÂÂÂÂLENOVOÂÂÂST900MM0168ÂÂÂÂÂÂL587 PQ: 0 ANSI: 6

[1] https://lore.kernel.org/patchwork/cover/1078960/