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    SubjectRE: Oops in fs_enet driver with preempt-rt
    Date
    From
    Rune Torgersen wrote:
    > Hi
    > I am trying to get preempt-rt (v2.6.25.4-rt1) to work on a Freescale
    > 8280 CPU (arch/powerpc)
    >
    > I get the follwing oops when trying to enable ethernet:
    > (looks like a null pointer dereference in
    > drivers/net/fs_enet/fs_enet-main.c:106)

    And if I disable NAPI I get this one instead:

    Bringing up the eth1 interface...Unable to handle kernel paging request
    for data at address 0x00000000
    Faulting instruction address: 0xc019706c
    Oops: Kernel access of bad area, sig: 11 [#1]
    PREEMPT Innovative Systems ApMax
    Modules linked in:
    NIP: c019706c LR: c0196d84 CTR: c0198790
    REGS: ef2c3cb0 TRAP: 0300 Not tainted (2.6.25.4-rt1)
    MSR: 00009032 <EE,ME,IR,DR> CR: 42004222 XER: 00000000
    DAR: 00000000, DSISR: 20000000
    TASK = ef2ac590[114] 'ifconfig' THREAD: ef2c2000
    GPR00: 00000000 ef2c3d60 ef2ac590 ef37f000 00000008 00000000 ef2c3d5c
    0000008c
    GPR08: ef2c3d38 00000008 ef2c3d40 00000001 22000222 10021454 00000000
    100a37b0
    GPR16: 10090000 ef3e71e0 ef3e71e0 00000000 10070000 00000008 100192c0
    00008914
    GPR24: ef37f000 ef37f5a0 00000000 c0196d34 00000000 ef37f5a0 fffffff4
    ef2973a0
    NIP [c019706c] fs_enet_interrupt+0x338/0x5f4
    LR [c0196d84] fs_enet_interrupt+0x50/0x5f4
    Call Trace:
    [ef2c3d60] [c024a270] __spin_unlock_irqrestore+0x20/0x4c (unreliable)
    [ef2c3db0] [c0049a04] request_irq+0xb8/0xfc
    [ef2c3de0] [c0198044] fs_enet_open+0x8c/0x210
    [ef2c3e00] [c01d9b4c] dev_open+0x80/0xe8
    [ef2c3e10] [c01d89ac] dev_change_flags+0xc8/0x19c
    [ef2c3e30] [c021bfb0] devinet_ioctl+0x284/0x6f0
    [ef2c3e90] [c021c8fc] inet_ioctl+0xc0/0xf4
    [ef2c3ea0] [c01cbec4] sock_ioctl+0x200/0x23c
    [ef2c3ec0] [c00810c0] vfs_ioctl+0x44/0xa8
    [ef2c3ee0] [c0081520] do_vfs_ioctl+0x3fc/0x440
    [ef2c3f10] [c00815a4] sys_ioctl+0x40/0x70
    [ef2c3f40] [c000fcf0] ret_from_syscall+0x0/0x38
    --- Exception: c01 at 0xff6a37c
    LR = 0xffecd58
    Instruction dump:
    7c0004ac b01c0000 72e02000 3b9c0008 41820008 839d00bc 813d00a0 7f03c378
    81290034 7d2903a6 4e800421 7c0004ac <a01c0000> 0c000000 4c00012c
    5417043e
    ---[ end trace 61ff5e5c97ddf707 ]---

    Seems to be caused by line 471 in fs_enet_main:

    0xc0196d84 is in fs_enet_interrupt
    (drivers/net/fs_enet/fs_enet-main.c:473).
    468 if (fpi->use_napi)
    469 int_clr_events &= ~fep->ev_napi_rx;
    470
    471 (*fep->ops->clear_int_events)(dev,
    int_clr_events);
    472
    473 if (int_events & fep->ev_err)
    474 (*fep->ops->ev_error)(dev, int_events);
    475
    476 if (int_events & fep->ev_rx) {
    477 if (!fpi->use_napi)
    (gdb)


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