Date:	Wed, 23 Feb 2011 01:14:11 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Jay Cliburn <jcliburn@...il.com>,
	Chris Snook <chris.snook@...il.com>,
	Jie Yang <jie.yang@...eros.com>
Cc:	614622@...s.debian.org, netdev <netdev@...r.kernel.org>,
	Daniel Kahn Gillmor <dkg@...thhorseman.net>
Subject: Re: Bug#614622: linux-image-2.6.37-1-686: atl2 NIC claims NO
 CARRIER after suspend/resume; rmmod+insmod fixes the problem

This bug report was made against Debian's package of Linux 2.6.37:

On Tue, 2011-02-22 at 13:08 -0500, Daniel Kahn Gillmor wrote:
> Package: linux-2.6
> Version: 2.6.37-1
> Severity: normal
> 
> I recently switched from 2.6.37-trunk-686 to 2.6.37-1-686.
> 
> after the switch, i find that sometimes my atl2.ko-driven onboard NIC
> persistently claims NO CARRIER after resuming from suspend-to-RAM,
> even when plugged into a legitimate ethernet port.  This is not
> entirely reliable, but maybe 50% of the time.
> 
> if i remove and re-load atl2.ko, the interface can properly detect the
> ethernet.
> 
> i'm happy to help debug this further if there is any information you
> want me to gather on this hardware.  Please let me know.

I don't see any changes to this driver between 2.6.37-rc4 (the first
version we built as '2.6.37-trunk-686') and 2.6.37, so I think Daniel
just had good luck with the earlier versions.

> ** Kernel log:
[...]
> [67880.276036] PM: suspend of devices complete after 147.583 msecs
> [67880.292274] PM: late suspend of devices complete after 16.227 msecs
> [67880.292426] ACPI: Preparing to enter system sleep state S3
> [67880.316648] PM: Saving platform NVS memory
> [67880.357927] Disabling non-boot CPUs ...
> [67880.357927] Back to C!
> [67880.357927] PM: Restoring platform NVS memory
> [67880.357927] Force enabled HPET at resume
> [67880.357927] ACPI: Waking up from system sleep state S3
> [67880.400865] HDA Intel 0000:00:1b.0: restoring config space at offset 0x1 (was 0x100006, writing 0x100002)
> [67880.400904] pci 0000:00:1c.0: restoring config space at offset 0x9 (was 0x1fff1, writing 0x3fc13fb1)
> [67880.400913] pci 0000:00:1c.0: restoring config space at offset 0x8 (was 0xfff0, writing 0x3fa03f90)
> [67880.400923] pci 0000:00:1c.0: restoring config space at offset 0x7 (was 0xf0, writing 0x1010)
> [67880.400937] pci 0000:00:1c.0: restoring config space at offset 0x1 (was 0x100104, writing 0x100107)
> [67880.400976] pci 0000:00:1c.1: restoring config space at offset 0x9 (was 0x1fff1, writing 0x3fe13fd1)
> [67880.400987] pci 0000:00:1c.1: restoring config space at offset 0x7 (was 0xf0, writing 0x2020)
> [67880.401001] pci 0000:00:1c.1: restoring config space at offset 0x1 (was 0x100106, writing 0x100107)
> [67880.401042] pci 0000:00:1c.2: restoring config space at offset 0x7 (was 0xf0, writing 0x3030)
> [67880.401056] pci 0000:00:1c.2: restoring config space at offset 0x1 (was 0x100106, writing 0x100107)
> [67880.401099] uhci_hcd 0000:00:1d.0: restoring config space at offset 0x1 (was 0x2800005, writing 0x2800001)
> [67880.401132] uhci_hcd 0000:00:1d.1: restoring config space at offset 0x1 (was 0x2800005, writing 0x2800001)
> [67880.401165] uhci_hcd 0000:00:1d.2: restoring config space at offset 0x1 (was 0x2800005, writing 0x2800001)
> [67880.401197] uhci_hcd 0000:00:1d.3: restoring config space at offset 0x1 (was 0x2800005, writing 0x2800001)
> [67880.401239] ehci_hcd 0000:00:1d.7: restoring config space at offset 0x1 (was 0x2900006, writing 0x2900002)
> [67880.401265] pci 0000:00:1e.0: restoring config space at offset 0xf (was 0x60000, writing 0x600ff)
> [67880.401538] PM: early resume of devices complete after 0.795 msecs
> [67880.406036] HDA Intel 0000:00:1b.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
> [67880.406048] HDA Intel 0000:00:1b.0: setting latency timer to 64
> [67880.406093] HDA Intel 0000:00:1b.0: irq 40 for MSI/MSI-X
> [67880.406136] pci 0000:00:1c.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
> [67880.406143] pci 0000:00:1c.0: setting latency timer to 64
> [67880.406156] pci 0000:00:1c.1: PCI INT B -> GSI 17 (level, low) -> IRQ 17
> [67880.406163] pci 0000:00:1c.1: setting latency timer to 64
> [67880.406176] pci 0000:00:1c.2: PCI INT C -> GSI 18 (level, low) -> IRQ 18
> [67880.406183] pci 0000:00:1c.2: setting latency timer to 64
> [67880.406198] uhci_hcd 0000:00:1d.0: PCI INT A -> GSI 23 (level, low) -> IRQ 23
> [67880.406208] uhci_hcd 0000:00:1d.0: setting latency timer to 64
> [67880.406234] usb usb2: root hub lost power or was reset
> [67880.406253] uhci_hcd 0000:00:1d.1: PCI INT B -> GSI 19 (level, low) -> IRQ 19
> [67880.406262] uhci_hcd 0000:00:1d.1: setting latency timer to 64
> [67880.406287] usb usb3: root hub lost power or was reset
> [67880.406303] uhci_hcd 0000:00:1d.2: PCI INT C -> GSI 18 (level, low) -> IRQ 18
> [67880.406313] uhci_hcd 0000:00:1d.2: setting latency timer to 64
> [67880.406337] usb usb4: root hub lost power or was reset
> [67880.406354] uhci_hcd 0000:00:1d.3: PCI INT D -> GSI 16 (level, low) -> IRQ 16
> [67880.406363] uhci_hcd 0000:00:1d.3: setting latency timer to 64
> [67880.406387] usb usb5: root hub lost power or was reset
> [67880.406405] ehci_hcd 0000:00:1d.7: PCI INT A -> GSI 23 (level, low) -> IRQ 23
> [67880.406415] ehci_hcd 0000:00:1d.7: setting latency timer to 64
> [67880.406486] pci 0000:00:1e.0: setting latency timer to 64
> [67880.406505] ata_piix 0000:00:1f.2: PCI INT B -> GSI 19 (level, low) -> IRQ 19
> [67880.406513] ata_piix 0000:00:1f.2: setting latency timer to 64
> [67880.406543] atl2 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
> [67880.406551] atl2 0000:03:00.0: setting latency timer to 64
> [67880.411177] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
> [67880.411186] i915 0000:00:02.0: setting latency timer to 64
> [67880.413110] sd 0:0:0:0: [sda] Starting disk
> [67880.652031] usb 1-5: reset high speed USB device using ehci_hcd and address 2
> [67880.896031] usb 1-8: reset high speed USB device using ehci_hcd and address 3
> [67882.532200] ata1.00: ACPI cmd ef/03:45:00:00:00:a0 (SET FEATURES) filtered out
> [67882.532209] ata1.00: ACPI cmd ef/03:0c:00:00:00:a0 (SET FEATURES) filtered out
> [67882.548191] ata1.00: configured for UDMA/133
> [67882.548697] PM: resume of devices complete after 2147.034 msecs
> [67882.549278] PM: Finishing wakeup.
> [67882.549283] Restarting tasks ... done.
> [67882.549761] video LNXVIDEO:00: Restoring backlight state
> [67882.980083] usb 3-2: new low speed USB device using uhci_hcd and address 5
> [67883.150414] atl2 0000:03:00.0: irq 41 for MSI/MSI-X
> [67883.151364] ADDRCONF(NETDEV_UP): eth0: link is not ready
> [67883.159163] usb 3-2: New USB device found, idVendor=0973, idProduct=0001
> [67883.159174] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
> [67883.159181] usb 3-2: Product: SchlumbergerSema Cryptoflex e-gate
> [67883.159187] usb 3-2: Manufacturer: SchlumbergerSema

I assume this is where Daniel reloads the driver:

> [67977.344181] atl2 0000:03:00.0: PCI INT A disabled
> [67977.379792] Atheros(R) L2 Ethernet Driver - version 2.2.3
> [67977.379802] Copyright (c) 2007 Atheros Corporation.
> [67977.379870] atl2 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
> [67977.379892] atl2 0000:03:00.0: setting latency timer to 64
> [67993.948723] atl2 0000:03:00.0: irq 41 for MSI/MSI-X
> [67993.949268] ADDRCONF(NETDEV_UP): eth0: link is not ready
> [67994.154327] atl2: eth0 NIC Link is Up<100 Mbps Full Duplex>
> [67994.154739] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

[...]
> ** PCI devices:
[...]
> 03:00.0 Ethernet controller [0200]: Atheros Communications L2 Fast Ethernet [1969:2048] (rev a0)
>         Subsystem: ASUSTeK Computer Inc. Device [1043:8233]
>         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, Cache Line Size: 16 bytes
>         Interrupt: pin A routed to IRQ 41
>         Region 0: Memory at fbfc0000 (64-bit, non-prefetchable) [size=256K]
>         Expansion ROM at fbfa0000 [disabled] [size=128K]
>         Capabilities: <access denied>
>         Kernel driver in use: atl2
[...]

Ben.

-- 
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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