netdev - skge - no traffic and oops after ifdown

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Date:	Fri, 27 Jan 2012 12:05:57 +0100
From:	Alban Browaeys <prahal@...oo.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org
Subject: skge - no traffic and oops after ifdown - 3.3-rc1 main tree

I opened https://bugzilla.kernel.org/show_bug.cgi?id=42665 namely oops
attachement and :

skge crash after attempt to setup as dhcp then ifdown

commit d0249e44432aa0ffcf710b64449b8eaa3722547e
Author: stephen hemminger <shemminger@...tta.com>
Date:   Thu Jan 19 14:37:18 2012 +0000

    skge: check for PCI dma mapping errors

    Driver should check for mapping errors.
    Machines with limited DMA maps may return an error when a PCI map is
    requested (not an issue on standard x86).

    Also use upper/lower 32 bits macros for clarity.

    Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>


leads to failure to ifup <skge interface> if this one is setup as dhcp (static
"works" but no traffic) then an ifdown leads to the attached oops.

Reverting this commit fixes both issues (traffic and ifdown) at least until
mainline tree commit 87f71ae2dd7471c1b4c94100be1f218e91dc64c3 .


  *-network:2
       description: Ethernet interface
       produit: 88E8001 Gigabit Ethernet Controller
       fabriquant: Marvell Technology Group Ltd.
       identifiant matériel: d
       information bus: pci@...0:01:0d.0
       nom logique: eth0
       version: 13
       numéro de série: 00:18:f3:02:33:79
       taille: 100Mbit/s
       capacité: 1Gbit/s
       bits: 32 bits
       horloge: 66MHz
       fonctionnalités: bus_master cap_list rom ethernet physical tp 10bt
10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=skge
driverversion=1.14 duplex=full latency=64 maxlatency=31 mingnt=23 multicast=yes
port=twisted pair promiscuous=yes speed=100Mbit/s
       ressources: irq:23 mémoire:fbff8000-fbffbfff portE/S:d400(taille=256)
mémoire:fbfa0000-fbfbffff



01:0d.0 Ethernet controller: Marvell Technology Group Ltd. 88E8001 Gigabit
Ethernet Controller (rev 13)
    Subsystem: ASUSTeK Computer Inc. Marvell 88E8001 Gigabit Ethernet
Controller (Asus)
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx-
    Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
    Latency: 64 (5750ns min, 7750ns max), Cache Line Size: 16 bytes
    Interrupt: pin A routed to IRQ 23
    Region 0: Memory at fbff8000 (32-bit, non-prefetchable) [size=16K]
    Region 1: I/O ports at d400 [size=256]
    Expansion ROM at fbfa0000 [disabled] [size=128K]
    Capabilities: <access denied>
    Kernel driver in use: skge

01:0d.0 0200: 11ab:4320 (rev 13)
    Subsystem: 1043:811a

arch i686.



Best regards,
Alban

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