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    SubjectRe: [PATCH 2/4] sysfs: Only take active references on attributes.
    On Mon, Feb 15, 2010 at 04:15:27PM +0800, Américo Wang wrote:
    >On Mon, Feb 15, 2010 at 03:27:45PM +0800, Américo Wang wrote:
    >>On Thu, Feb 11, 2010 at 03:20:00PM -0800, Eric W. Biederman wrote:
    >>>If we exclude directories and symlinks from the set of sysfs
    >>>dirents where we need active references we are left with
    >>>sysfs attributes (binary or not).
    >>>- Tweak sysfs_deactivate to only do something on attributes
    >>>- Move lockdep initialization into sysfs_file_add_mode to
    >>> limit it to just attributes.
    >>If I read your patch correctly, s_active will be useless
    >>for non-attributes sysfs entries? For sysfs dir, maybe,
    >>since it can only be removed by sysfs_remove_dir(),
    >>but not sure about sysfs symlinks...
    >For sysfs dir's, opening it will not get s_active,
    >since it doesn't have .open member. But it does
    >put s_active when removing it. This seems buggy?

    Oh, definitely no...

    s_active of sysfs dir is only for kernel space,
    after your previous patch.

    >For symlinks, it seems sysfs totally ignores s_active,
    >thus is safe for this patch.

    Thus, your patch seems correct.

    I think we could merge them for more testing.

    Acked-by: WANG Cong <>

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