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    SubjectRe: [PATCH 7/7] driver-core : convert semaphore to mutex in struct class
    On Fri, Jan 18, 2008 at 09:42:25AM +0800, Dave Young wrote:
    ...
    > After digging the class usage code again, I found that the only
    > possible double lock place is the class_interface_register/unregister
    > in which the class_device api could be called.

    OK, but currently after using mostly:
    mutex_lock(&parent_class)

    and once:
    mutex_lock_nested(&parent_class, SINGLE_DEPTH_NESTING)

    lockdep mostly thinks these parent classes are 2 different objects,
    with only 2 possible levels of nesting, so this parent_class has
    to have wrong name (2 parents can't be locked from the same thread,
    so maybe it's class_grandparent sometimes?).

    Jarek P.


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