linux-kernel - Oops in 3.0.30/fsl_usb2_device

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Date:	Tue, 1 May 2012 09:22:53 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
CC:	Peter Chen <peter.chen@...escale.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Oops in 3.0.30/fsl_usb2_device_register

Hi all,

I see the following oops in 3.0.30. This is with a Freescale 8536.

Unable to handle kernel paging request for data at address 0x00000000
Faulting instruction address: 0xc03f7e0c
Oops: Kernel access of bad area, sig: 11 [#1]
PREEMPT SE8000_lc8536
Modules linked in:
NIP: c03f7e0c LR: c03f7dd4 CTR: 00000000
REGS: ef837d50 TRAP: 0300   Not tainted  (3.0.30-767-gfd1550a)
MSR: 00029000 <EE,ME,CE>  CR: 82002024  XER: 20000000
DEAR: 00000000, ESR: 00800000
TASK = ef838000[1] 'swapper' THREAD: ef836000
GPR00: ef912008 ef837e00 ef838000 ef8cbc00 ef837e28 00000050 00000000 00000000
GPR08: 00000000 00000000 ffffffff ef9120f0 24002024 1017f868 deabfc4c 72947cde
GPR16: 31e01609 00000800 00000000 04100000 1f07fde8 1f180000 c09c8000 fffff000
GPR24: ef837e28 c0ae7d14 c09c75b4 ef906ae0 00000002 ef837e28 ef8cbc00 ef912000
NIP [c03f7e0c] fsl_usb2_device_register+0x74/0xf8
LR [c03f7dd4] fsl_usb2_device_register+0x3c/0xf8
Call Trace:
[ef837e00] [c03f7dd4] fsl_usb2_device_register+0x3c/0xf8 (unreliable)
[ef837e20] [c03f819c] fsl_usb2_mph_dr_of_probe+0x238/0x2bc
[ef837ea0] [c0285a00] platform_drv_probe+0x20/0x30
[ef837eb0] [c0283e6c] driver_probe_device+0xc8/0x1f8
[ef837ed0] [c0284070] __driver_attach+0xd4/0xd8
[ef837ef0] [c02833fc] bus_for_each_dev+0x7c/0xc4
[ef837f20] [c0283c34] driver_attach+0x24/0x34
[ef837f30] [c0282aa0] bus_add_driver+0xdc/0x2dc
[ef837f60] [c0284900] driver_register+0x94/0x198
[ef837f80] [c028609c] platform_driver_register+0x6c/0x7c
[ef837f90] [c04dd288] fsl_usb2_mph_dr_init+0x18/0x28
[ef837fa0] [c0001ddc] do_one_initcall+0x50/0x200
[ef837fd0] [c04bf1bc] kernel_init+0x9c/0x14c
[ef837ff0] [c000dd28] kernel_thread+0x4c/0x68
Instruction dump:
813f0080 381f0008 815f0084 7fa4eb78 901e0008 38a00050 913e0080 915e0084
817f0078 811e0078 812b0000 814b0004
 91480004 4be8e679 2c030000
 ---[ end trace 3a8eb627b8e9e0fb ]---

Problem was introduced with commit d39514c14bd941232976b68e2750dc725b90e724.
The commit claims that dma_mask is already set in arch_setup_pdev_archdata().
However, that only seems to be true for the current kernel, not for 3.0.
As a result, dma_mask is NULL in fsl_usb2_device_register, causing the above oops.

Question now is if d39514c14bd941232976b68e2750dc725b90e724 should be reverted from 3.0,
or if there is a better solution. Any thoughts/ideas ?

Thanks,
Guenter
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