Hi, I've been using UIO for a userspace driver and noticed a feature when multiple uio file handles have been opened for the same device (e.g. when running separate processes).
Since each handle stores its own count of the interrupts and uses this to determine whether uio_read returns, it's possible for uio_read to return before a new interrupt has occurred. Was this the intended behaviour? In my case, the irq is associated with completion of some hw processing so it seems a little strange to me. I expected uio_read to return only after an interrupt occurs that hasn't been already been handled by userspace code. Thanks Phil -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
