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    SubjectRe: 2.6.7-mm4: regression: ieee1394: sbp2: null pointer dereference
    Hi,

    Ben Collins:
    > This oops traces back into the scsi stack, right?

    Umm ... not that I know of. It basically says

    sbp2_logout_device+0x13/0x140 [sbp2]
    kernel: [<fb2c49f1>] sbp2_update+0x21/0x80 [sbp2]

    No SCSI anywhere (that I can see).

    sbp2_update+0x21 points to the instruction after a call to
    sbp2_logout_device(), so that matches up. GDB says the error is here:

    sbp2.c:1323: scsi_id->logout_orb->reserved1 = 0x0;

    which probably means that either scsi_id or logout_orb is NULL.

    > I guess USB doesn't have too many problems since it does a
    > scsi-host per device, but that's not as easy with sbp2 and 1394, since a
    > single sbp2 device can have multiple LUN's, and it's just easier to
    > treat that as one scsi host.
    >
    So can USB; I have a card reader here which registers a different LUN
    per card interface.

    > I can't reproduce it, but I'll try to get into the logic of sbp2 device
    > removal again to see if I can find out where and why this is occuring.

    FWIW, here's the device info (from gscanbus):

    SelfID Info
    -----------
    Physical ID: 2
    Link active: Yes
    Gap Count: 10
    PHY Speed: S400
    PHY Delay: <=144ns
    IRM Capable: No
    Power Class: None
    Port 0: Connected to parent node
    Port 1: Connected to child node
    Init. reset: No

    CSR ROM Info
    ------------
    GUID: 0x00A0B80A0000144F
    Node Capabilities: 0x000083C0
    Vendor ID: 0x0000A0B8
    Unit Spec ID: 0x0000609E
    Unit SW Version: 0x00010483
    Model ID: 0x00000000
    Nr. Textual Leafes: 2

    Vendor: SYMBIOS LOGIC INC.
    Textual Leafes:
    LSI Logic
    LSI 501 rev B3

    AV/C Subunits
    -------------
    N/A



    --
    Matthias Urlichs | {M:U} IT Design @ m-u-it.de | smurf@smurf.noris.de
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