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    SubjectRe: Modules with list
    Rusty Russell writes:
    >In message <200211260649.WAA22216@adam.yggdrasil.com> you write:
    >> >TCP for example, sets the destructor function for the skb. It can be
    >> >called an arbitrary time later. Netfilter modules do a similar thing,
    >> >for similar reasons. You'd better grab a reference to *something*.
    >>
    >> The ->remove() function of a network device driver will
    >> not return until it has freed all receive skb's that it allocated
    >> and all transmit skb's that were passed to its transmit function.

    >I'm not talking about a device driver, but modularizing the IPv4
    >stack.

    I don't see skb->destructor being set in net/ipv4 (although I
    see it in other net/ subdirectories). Anyhow, I don't see why ipv4
    would need to increment or decrement a module reference count every
    time a packet is sent or received. It should suffice to do so when a
    file descriptor is opened or closed and when a network connection is
    created or completely forgotten (if that does not necessarily happen
    before the close system call returns).

    Adam J. Richter __ ______________ 575 Oroville Road
    adam@yggdrasil.com \ / Milpitas, California 95035
    +1 408 309-6081 | g g d r a s i l United States of America
    "Free Software For The Rest Of Us."

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