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    SubjectDevfs races with block devices
    [Finally, after other things have stabilised, I'm ready to tackle this
    issue]

    Alexander Viro writes:
    > BTW, here's one more devfs rmmod race: check_disk_changed() in
    > fs/devfs/base.c. Calling ->check_media_change() with no protection
    > whatsoever. If rmmod happens at that point...

    How about if I do this sequence:
    lock_kernel();
    devfs checks;
    if (bd_op->owner)
    __MOD_INC_USE_COUNT(bd_op->owner);
    revalidate();
    if (bd_op->owner)
    __MOD_DEC_USE_COUNT(bd_op->owner);
    unlock_kernel();

    Is there any reason why that won't work?

    Regards,

    Richard....
    Permanent: rgooch@atnf.csiro.au
    Current: rgooch@ras.ucalgary.ca
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