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    SubjectOops 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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