Re: kmem_cache_alloc fail with unable to handle paging request after pci hotplug remove.

From: AceLan Kao
Date: Mon Jul 04 2016 - 23:00:36 EST

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Hi,

These are logs from my machine.

*** Before plug-in the USB key

u@u-XPS-13-9xxx:~$ sudo lspci -vvvv -s 00:1c.0
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1) (prog-if 00
[Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 16
Bus: primary=00, secondary=01, subordinate=39, sec-latency=0
I/O behind bridge: 00002000-00002fff
Memory behind bridge: c4000000-da0fffff
Prefetchable memory behind bridge: 00000000a0000000-00000000c1ffffff
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort+ <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: [40] Express (v2) Root Port (Slot+), MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0
ExtTag- RBE+
DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq-
AuxPwr+ TransPend-
LnkCap: Port #1, Speed 8GT/s, Width x2, ASPM L1, Exit
Latency L0s unlimited, L1 <16us
ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
LnkCtl: ASPM L1 Enabled; RCB 64 bytes Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x0, TrErr- Train-
SlotClk+ DLActive- BWMgmt- ABWMgmt-
SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd-
HotPlug+ Surprise+
Slot #4, PowerLimit 25.000W; Interlock- NoCompl+
SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet+
CmdCplt- HPIrq- LinkChg-
Control: AttnInd Unknown, PwrInd Unknown,
Power- Interlock-
SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt-
PresDet- Interlock-
Changed: MRL- PresDet- LinkState-
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal-
PMEIntEna- CRSVisible-
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal-
PMEIntEna- CRSVisible-
RootCap: CRSVisible-
RootSta: PME ReqID 0000, PMEStatus- PMEPending-
DevCap2: Completion Timeout: Range ABC, TimeoutDis+,
LTR+, OBFF Not Supported ARIFwd+
DevCtl2: Completion Timeout: 50us to 50ms,
TimeoutDis-, LTR-, OBFF Disabled ARIFwd-
LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -3.5dB,
EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-,
LinkEqualizationRequest-
Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
Address: 00000000 Data: 0000
Capabilities: [90] Subsystem: Dell Device 075b
Capabilities: [a0] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [100 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt-
UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO+ CmpltAbrt-
UnxCmplt+ RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES- TLP- FCP- CmpltTO- CmpltAbrt-
UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 00, GenCap- CGenEn- ChkCap- ChkEn-
Capabilities: [140 v1] Access Control Services
ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+
UpstreamFwd- EgressCtrl- DirectTrans-
ACSCtl: SrcValid- TransBlk- ReqRedir- CmpltRedir-
UpstreamFwd- EgressCtrl- DirectTrans-
Capabilities: [220 v1] #19
Kernel driver in use: pcieport
Kernel modules: shpchp

*** Plug-in the USB key

u@u-XPS-13-9xxx:~$ lspci -t
-[0000:00]-+-00.0
+-02.0
+-04.0
+-14.0
+-14.2
+-15.0
+-15.1
+-16.0
+-17.0
+-1c.0-[01-39]----00.0-[02-39]--+-00.0-[03]--
| +-01.0-[04-38]--
| \-02.0-[39]----00.0
+-1c.4-[3a]----00.0
+-1c.5-[3b]----00.0
+-1f.0
+-1f.2
+-1f.3
\-1f.4

u@u-XPS-13-9xxx:~$ lspci
00:00.0 Host bridge: Intel Corporation Device 5904 (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Device 5916 (rev 02)
00:04.0 Signal processing controller: Intel Corporation Skylake
Processor Thermal Subsystem (rev 02)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0
xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise
Point-LP Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise
Point-LP Serial IO I2C Controller (rev 21)
00:15.1 Signal processing controller: Intel Corporation Sunrise
Point-LP Serial IO I2C Controller (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP
CSME HECI (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA
Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port (rev f1)
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port (rev f1)
00:1f.0 ISA bridge: Intel Corporation Device 9d58 (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
01:00.0 PCI bridge: Intel Corporation Device 1576
02:00.0 PCI bridge: Intel Corporation Device 1576
02:01.0 PCI bridge: Intel Corporation Device 1576
02:02.0 PCI bridge: Intel Corporation Device 1576
39:00.0 USB controller: Intel Corporation Device 15b5
3a:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless
Network Adapter (rev 32)
3b:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd.
RTS525A PCI Express Card Reader (rev 01)

*** Remove the USB key

u@u-XPS-13-9xxx:~$ lspci -t
-[0000:00]-+-00.0
+-02.0
+-04.0
+-14.0
+-14.2
+-15.0
+-15.1
+-16.0
+-17.0
+-1c.0-[01-39]--
+-1c.4-[3a]----00.0
+-1c.5-[3b]----00.0
+-1f.0
+-1f.2
+-1f.3
\-1f.4

u@u-XPS-13-9xxx:~$ lspci
00:00.0 Host bridge: Intel Corporation Device 5904 (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Device 5916 (rev 02)
00:04.0 Signal processing controller: Intel Corporation Skylake
Processor Thermal Subsystem (rev 02)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0
xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise
Point-LP Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise
Point-LP Serial IO I2C Controller (rev 21)
00:15.1 Signal processing controller: Intel Corporation Sunrise
Point-LP Serial IO I2C Controller (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP
CSME HECI (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA
Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port (rev f1)
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port (rev f1)
00:1f.0 ISA bridge: Intel Corporation Device 9d58 (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
3a:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless
Network Adapter (rev 32)
3b:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd.
RTS525A PCI Express Card Reader (rev 01)

u@u-XPS-13-9xxx:~$ sudo lspci -vvvv -s 00:1c.0
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1) (prog-if 00
[Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 16
Bus: primary=00, secondary=01, subordinate=39, sec-latency=0
I/O behind bridge: 00002000-00002fff
Memory behind bridge: c4000000-da0fffff
Prefetchable memory behind bridge: 00000000a0000000-00000000c1ffffff
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort+ <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: [40] Express (v2) Root Port (Slot+), MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0
ExtTag- RBE+
DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq-
AuxPwr+ TransPend-
LnkCap: Port #1, Speed 8GT/s, Width x2, ASPM L1, Exit
Latency L0s <1us, L1 <16us
ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x2, TrErr- Train-
SlotClk+ DLActive- BWMgmt+ ABWMgmt-
SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd-
HotPlug+ Surprise+
Slot #4, PowerLimit 25.000W; Interlock- NoCompl+
SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet+
CmdCplt- HPIrq- LinkChg-
Control: AttnInd Unknown, PwrInd Unknown,
Power- Interlock-
SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt-
PresDet- Interlock-
Changed: MRL- PresDet- LinkState+
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal-
PMEIntEna- CRSVisible-
RootCap: CRSVisible-
RootSta: PME ReqID 0000, PMEStatus- PMEPending-
DevCap2: Completion Timeout: Range ABC, TimeoutDis+,
LTR+, OBFF Not Supported ARIFwd+
DevCtl2: Completion Timeout: 50us to 50ms,
TimeoutDis-, LTR-, OBFF Disabled ARIFwd-
LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -3.5dB,
EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-,
LinkEqualizationRequest-
Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
Address: 00000000 Data: 0000
Capabilities: [90] Subsystem: Dell Device 075b
Capabilities: [a0] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [100 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt-
UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO+ CmpltAbrt-
UnxCmplt+ RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES- TLP- FCP- CmpltTO- CmpltAbrt-
UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr+ BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 00, GenCap- CGenEn- ChkCap- ChkEn-
Capabilities: [140 v1] Access Control Services
ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+
UpstreamFwd- EgressCtrl- DirectTrans-
ACSCtl: SrcValid- TransBlk- ReqRedir- CmpltRedir-
UpstreamFwd- EgressCtrl- DirectTrans-
Capabilities: [220 v1] #19
Kernel driver in use: pcieport
Kernel modules: shpchp

2016-07-04 23:45 GMT+08:00 Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>:
> On 04.07.2016 18:21, Lukas Wunner wrote:
>>
>> On Mon, Jul 04, 2016 at 06:04:42PM +0300, Mathias Nyman wrote:
>>>
>>> On 04.07.2016 17:25, Rafael J. Wysocki wrote:
>>>>
>>>> On Mon, Jul 4, 2016 at 4:26 PM, Mathias Nyman
>>>> <mathias.nyman@xxxxxxxxxxxxxxx> wrote:
>>>>>
>>>>> AceLan Kao can get his DELL XPS 13 laptop to hang by
>>>>> plugging/un-plugging
>>>>> a USB 3.1 key via thunderbolt port.
>>>>>
>>>>> Allocating memory fails after this, always pointing to NULL pointer or
>>>>> page request failing in get_freepointer() called by
>>>>> kmalloc/kmem_cache_alloc.
>>>>>
>>>>> Unplugging a usb type-c device from the thunderbolt port on Alpine
>>>>> Ridge
>>>>> based systems like this one will hotplug remove PCI bridges together
>>>>> with the USB xhci controller behind them.
>>
>>
>> Yes, that matches with the lspci output you've posted, the whole
>> Thunderbolt controller is gone after unplug. Perhaps it's powered
>> down? What does "lspci -vvvv -s 00:1d.6" say? (Does the root port
>> still have a link to the Thunderbolt controller?)
>>
>
>
> "lspci -vvvv -s 00:1d.6" after unplug (on my working DELL XPS)
>
>
> 00:1d.6 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port
> #15 (rev f1) (prog-if 00 [Normal decode])
> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
> Stepping- SERR- FastB2B- DisINTx-
> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
> <TAbort- <MAbort- >SERR- <PERR- INTx-
> Latency: 0
> Interrupt: pin C routed to IRQ 18
> Bus: primary=00, secondary=06, subordinate=3e, sec-latency=0
> I/O behind bridge: 00002000-00002fff
> Memory behind bridge: c4000000-da0fffff
> Prefetchable memory behind bridge: 0000000080000000-00000000a1ffffff
> Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort-
> <TAbort- <MAbort+ <SERR- <PERR-
> BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
> PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
> Capabilities: [40] Express (v2) Root Port (Slot+), MSI 00
> DevCap: MaxPayload 256 bytes, PhantFunc 0
> ExtTag- RBE+
> DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
> Unsupported-
> RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
> MaxPayload 128 bytes, MaxReadReq 128 bytes
> DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq- AuxPwr+
> TransPend-
> LnkCap: Port #15, Speed 8GT/s, Width x2, ASPM L0s L1, Exit
> Latency L0s <1us, L1 <16us
> ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
> LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
> ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> LnkSta: Speed 2.5GT/s, Width x2, TrErr- Train- SlotClk+
> DLActive- BWMgmt+ ABWMgmt-
> SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+
> Surprise+
> Slot #18, PowerLimit 25.000W; Interlock- NoCompl+
> SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet+ CmdCplt-
> HPIrq- LinkChg-
> Control: AttnInd Unknown, PwrInd Unknown, Power-
> Interlock-
> SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet-
> Interlock-
> Changed: MRL- PresDet- LinkState+
> RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna-
> CRSVisible-
> RootCap: CRSVisible-
> RootSta: PME ReqID 0000, PMEStatus- PMEPending-
> DevCap2: Completion Timeout: Range ABC, TimeoutDis+, LTR+,
> OBFF Not Supported ARIFwd+
> DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-,
> LTR-, OBFF Disabled ARIFwd-
> LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance-
> SpeedDis-
> Transmit Margin: Normal Operating Range,
> EnterModifiedCompliance- ComplianceSOS-
> Compliance De-emphasis: -6dB
> LnkSta2: Current De-emphasis Level: -3.5dB,
> EqualizationComplete-, EqualizationPhase1-
> EqualizationPhase2-, EqualizationPhase3-,
> LinkEqualizationRequest-
> Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
> Address: 00000000 Data: 0000
> Capabilities: [90] Subsystem: Dell Sunrise Point-H PCI Express Root
> Port
> Capabilities: [a0] Power Management version 3
> Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
> PME(D0+,D1-,D2-,D3hot+,D3cold+)
> Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
> Capabilities: [100 v1] Advanced Error Reporting
> UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt-
> RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
> UEMsk: DLP- SDES- TLP- FCP- CmpltTO+ CmpltAbrt- UnxCmplt+
> RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
> UESvrt: DLP+ SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt-
> RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
> CESta: RxErr+ BadTLP- BadDLLP- Rollover+ Timeout+
> NonFatalErr+
> CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout-
> NonFatalErr+
> AERCap: First Error Pointer: 00, GenCap- CGenEn- ChkCap-
> ChkEn-
> Capabilities: [140 v1] Access Control Services
> ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+
> UpstreamFwd- EgressCtrl- DirectTrans-
> ACSCtl: SrcValid- TransBlk- ReqRedir- CmpltRedir-
> UpstreamFwd- EgressCtrl- DirectTrans-
> Capabilities: [200 v1] L1 PM Substates
> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+
> L1_PM_Substates+
> PortCommonModeRestoreTime=40us
> PortTPowerOnTime=10us
> Capabilities: [220 v1] #19
> Kernel driver in use: pcieport
> Kernel modules: shpchp
>
>
> AceLan Kao, can you confirm your lspci output looks similar on the failing
> DELL XPS?
>
> -Mathias

--
Chia-Lin Kao(AceLan)
http://blog.acelan.idv.tw/
E-Mail: acelan.kaoATcanonical.com (s/AT/@/)

Next message: Po Liu: "RE: [PATCH v3 2/2] pci/aer: interrupt fixup in the quirk"
Previous message: Sugar Zhang: "[PATCH] ASoC: rockchip: implement system suspend/resume for spdif"
In reply to: Mathias Nyman: "Re: kmem_cache_alloc fail with unable to handle paging request after pci hotplug remove."
Next in thread: Lukas Wunner: "Re: kmem_cache_alloc fail with unable to handle paging request after pci hotplug remove."
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