Re: [PATCH] libata: skip reset on bus not a device

["Joe Jin" <lkmaillist@gmail.com>]

> # lspci -nvvvxxx -s 00:1f.

00:1f.0 Class 0601: 8086:27b8 (rev 01)
       Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B-
       Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium
> TAbort- <TAbort- <MAbort- >SERR- <PERR-
       Latency: 0
       Capabilities: <available only to root>
00: 86 80 b8 27 07 01 10 02 01 00 01 06 00 00 80 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 e0 00 00 00 00 00 00 00 00 00 00 00

00:1f.1 Class 0101: 8086:27df (rev 01) (prog-if 8a [Master SecP PriP])
       Subsystem: 1028:01ad
       Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
       Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium
> TAbort- <TAbort- <MAbort- >SERR- <PERR-
       Latency: 0
       Interrupt: pin A routed to IRQ 169
       Region 0: I/O ports at <ignored>
       Region 1: I/O ports at <ignored>
       Region 2: I/O ports at <ignored>
       Region 3: I/O ports at <ignored>
       Region 4: I/O ports at ffa0 [size=16]
00: 86 80 df 27 05 00 88 02 01 8a 01 01 00 00 00 00
10: f1 01 00 00 f5 03 00 00 71 01 00 00 75 03 00 00
20: a1 ff 00 00 00 00 00 00 00 00 00 00 28 10 ad 01
30: 00 00 00 00 00 00 00 00 00 00 00 00 0b 01 00 00

00:1f.2 Class 0101: 8086:27c0 (rev 01) (prog-if 8f [Master SecP SecO PriP PriO])
       Subsystem: 1028:01ad
       Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
       Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium
> TAbort- <TAbort- <MAbort- >SERR- <PERR-
       Latency: 0
       Interrupt: pin C routed to IRQ 217
       Region 0: I/O ports at fe00 [size=8]
       Region 1: I/O ports at fe10 [size=4]
       Region 2: I/O ports at fe20 [size=8]
       Region 3: I/O ports at fe30 [size=4]
       Region 4: I/O ports at fea0 [size=16]
       Capabilities: <available only to root>
00: 86 80 c0 27 07 00 b0 02 01 8f 01 01 00 00 00 00
10: 01 fe 00 00 11 fe 00 00 21 fe 00 00 31 fe 00 00
20: a1 fe 00 00 00 00 00 00 00 00 00 00 28 10 ad 01
30: 00 00 00 00 70 00 00 00 00 00 00 00 05 03 00 00

00:1f.3 Class 0c05: 8086:27da (rev 01)
       Subsystem: 1028:01ad
       Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B-
       Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium
> TAbort- <TAbort- <MAbort- >SERR- <PERR-
       Interrupt: pin B routed to IRQ 177
       Region 4: I/O ports at e8a0 [size=32]
00: 86 80 da 27 01 01 80 02 01 00 05 0c 00 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: a1 e8 00 00 00 00 00 00 00 00 00 00 28 10 ad 01
30: 00 00 00 00 00 00 00 00 00 00 00 00 0a 02 00 00

> Hmmm... Not really.  The controller shouldn't report BSY for empty
> channel.  There's a notable exception where PATA pins aren't properly
> pulled resulting in 0xff status on empty channels.  IDE handles the case
> specially but libata doesn't yet.  Can you try the attached patch?

it still  occured after apply the patch :(

-Joe
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