[Regression] commit 8a4aeec8d(libata/ahci: accommodate tag ordered controllers)

[Ming Lei]

Hi Dan and Tejun,

Looks the commit 8a4aeec8d(libata/ahci: accommodate tag ordered
controllers) causes below sata failure[1] on APM AHCI controller.

And the error does disappear after reverting the commit.

Thanks,
--
Ming Lei

[1], failure log
[   72.001579] ata4.00: exception Emask 0x40 SAct 0xff00 SErr 0x800
action 0x6 frozen
[   72.009116] ata4: SError: { HostInt }
[   72.012763] ata4.00: failed command: READ FPDMA QUEUED
[   72.017878] ata4.00: cmd 60/08:40:e0:a4:88/00:00:04:00:00/40 tag 8
ncq 4096 in
[   72.017878]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask
0x44 (timeout)
[   72.032498] ata4.00: status: { DRDY }
[   72.036139] ata4.00: failed command: READ FPDMA QUEUED
[   72.041252] ata4.00: cmd 60/18:48:b8:3e:10/00:00:09:00:00/40 tag 9
ncq 12288 in
[   72.041252]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask
0x44 (timeout)
[   72.055956] ata4.00: status: { DRDY }
[   72.059598] ata4.00: failed command: READ FPDMA QUEUED
[   72.064713] ata4.00: cmd 60/08:50:00:be:07/01:00:01:00:00/40 tag 10
ncq 135168 in
[   72.064713]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask
0x44 (timeout)
[   72.079589] ata4.00: status: { DRDY }
[   72.083233] ata4.00: failed command: READ FPDMA QUEUED
[   72.088345] ata4.00: cmd 60/08:58:00:07:09/00:00:06:00:00/40 tag 11
ncq 4096 in
[   72.088345]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask
0x44 (timeout)
[   72.103049] ata4.00: status: { DRDY }
[   72.106691] ata4.00: failed command: READ FPDMA QUEUED
[   72.111805] ata4.00: cmd 60/08:60:00:4b:f9/00:00:0d:00:00/40 tag 12
ncq 4096 in
[   72.111805]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask
0x44 (timeout)
[   72.126509] ata4.00: status: { DRDY }
[   72.130151] ata4.00: failed command: READ FPDMA QUEUED
[   72.135265] ata4.00: cmd 60/20:68:28:f5:3a/00:00:09:00:00/40 tag 13
ncq 16384 in
[   72.135265]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask
0x44 (timeout)
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