Messages in this thread | | | Date | Wed, 14 Mar 2007 16:24:54 -0700 (PDT) | From | Davide Libenzi <> | Subject | Re: [patch 13/13] signalfd/timerfd/asyncfd v5 - KAIO asyncfd support (example/maybe-broken) ... |
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On Wed, 14 Mar 2007, Benjamin LaHaise wrote:
> On Wed, Mar 14, 2007 at 03:19:21PM -0700, Davide Libenzi wrote: > > + /* > > + * Check if the user asked us to deliver the result through an > > + * asyncfd. Note that asyncfd_add_results() may sleep. It seems > > + * OK looking at the code, but I'm not sure since inside a USB driver, > > + * aio_complete() is called with a spinlock held. !!CHECK > > + */ > > That won't work. aio_complete() is supposed to be irq safe.
Can you point me to a kernel path that ends up calling aio_complete() in a do-not-sleep mode? The offender I see is drivers/usb/gadget/inode.c that calls it with a spinlock held. The aio_run_iocb function seem to release/reacquire the lock before calling aio_complete().
- Davide
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