netdev - Fwd: KS8851 SPI Driver Integration

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Date:	Sat, 21 Nov 2009 18:16:14 -0600
From:	Abraham Arce <abraham.arce.moreno@...il.com>
To:	ben@...tec.co.uk
Cc:	netdev@...r.kernel.org
Subject: Fwd: KS8851 SPI Driver Integration

Hi Ben,

I am currently working with ks8851snl driver and facing some issues,
the system integrated with is OMAP4, a ARM Cortex A9 Dual Core. I am
using the following commit as latest

commit 94da210af4978b94cb70318bd1b282a73c50b175
Author: Simon Kagstrom <simon.kagstrom@...insight.net>
   net: fix ks8851 build errors

   Fix build errors due to missing Kconfig select of CRC32:

   ks8851.c:(.text+0x7d2ee): undefined reference to `crc32_le'
   ks8851.c:(.text+0x7d2f5): undefined reference to `bitrev32'

I can summarize the problems as follows:

* Driver won't be able to get ip address via dhcp if SMP/Preemption/L2
Cache are enabled, I have not enabled/disabled one by one to narrow
down the problem...


* Having one single core running, dhcp works, I can ping with small
size packets but cannot mount any nfs directory, 2 different scenarios
listed below, nfs server is up


* Timeout when trying to mount a nfs directory from a system already
booted, if I try to cancel the request then the following messages
will be seen, console access cannot be recovered immediately

 rpcbind: server localhost not responding, timed out
 CTRL-C
 svc: failed to register lockdv1 RPC service (errno 5).
 lockd_up: makesock failed, error=-5


* Kernel NULL pointer when trying to mount a nfs directory using
bootargs or after some time of pinging to any other ip

Unable to handle kernel NULL pointer dereference at virtual address 00000054
pgd = c0004000
[00000054] *pgd=00000000
Internal error: Oops: 5 [#1]
Modules linked in:
CPU: 0    Not tainted  (2.6.31-00145-g85deb91-dirty #12)
PC is at ks8851_tx_work+0x74/0x19c
LR is at ks8851_tx_work+0x70/0x19c
pc : [<c01b3c04>]    lr : [<c01b3c00>]    psr: a0000013
sp : cf82ff50  ip : cf82ff50  fp : cf82ff8c
r10: cf85e2e1  r9 : cf85e3a0  r8 : cf85e2c8
r7 : cf85e368  r6 : 00000001  r5 : 00000000  r4 : cf85e2c0
r3 : c03316b8  r2 : 00000001  r1 : 00000000  r0 : c02cbd5d
Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: 10c53c7d  Table: 80004059  DAC: 00000017
Process events/0 (pid: 4, stack limit = 0xcf82e2e8)
Stack: (0xcf82ff50 to 0xcf830000)
ff40:                                     00000000 0000006e cf99f876 00000001
ff60: c0259ac8 c01b3b90 cf800388 cf800380 cf82e000 00000000 00000000 00000000
ff80: cf82ffc4 cf82ff90 c004e57c c01b3b9c cf82ffc4 00000000 cf822960 c0051e34
ffa0: cf82ffa0 cf82ffa0 cf82ffcc cf825f20 cf800380 c004e474 cf82fff4 cf82ffc8
ffc0: c0051a14 c004e480 00000000 00000000 cf82ffd0 cf82ffd0 00000000 00000000
ffe0: 00000000 00000000 00000000 cf82fff8 c0041de8 c0051998 ffffffff 00000000
Backtrace:
[<c01b3b90>] (ks8851_tx_work+0x0/0x19c) from [<c004e57c>] (worker_thread+0x108/0
x180)
[<c004e474>] (worker_thread+0x0/0x180) from [<c0051a14>] (kthread+0x88/0x90)
 r7:c004e474 r6:cf800380 r5:cf825f20 r4:cf82ffcc
[<c005198c>] (kthread+0x0/0x90) from [<c0041de8>] (do_exit+0x0/0x580)
 r7:00000000 r6:00000000 r5:00000000 r4:00000000
Code: 0a00000d e5940004 ebffd711 e58d5000 (e5952054)
---[ end trace 1c6069e68868725a ]---
ks8851 spi1.0: ks8851_start_xmit: skb cf91c208, 110@...9f876
ks8851 spi1.0: ks8851_start_xmit: skb cf8e83c0, 110@...c8076

I'll appreciate any advice about these issues...

Best Regards
Abraham
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