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    SubjectRe: [patch 13/13] signalfd/timerfd/asyncfd v5 - KAIO asyncfd support (example/maybe-broken) ...
    On Wed, 14 Mar 2007, Davide Libenzi wrote:

    > On Wed, 14 Mar 2007, Benjamin LaHaise wrote:
    >
    > > On Wed, Mar 14, 2007 at 04:24:54PM -0700, Davide Libenzi wrote:
    > > > Can you point me to a kernel path that ends up calling aio_complete() in a
    > > > do-not-sleep mode?
    > >
    > > If you remove that invariant, then it is very difficult for device drivers
    > > and other code to make use of aio_complete().
    > >
    > > > The offender I see is drivers/usb/gadget/inode.c that calls it with a
    > > > spinlock held.
    > >
    > > Which was from irq context last time I checked.

    The drivers/usb/gadget/inode.c case seems to be easily fixeable AFAICS, in
    the ep_aio_complete() function.
    I was more under the impression that aio_complete() was more of a tasklet
    kind of domain.



    - Davide


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