[Bug 194727] uaudio device gets disconnected, and hangs usb until everything using /dev/mixer* is closed

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194727

--- Comment #51 from Ed Maste <emaste at freebsd.org> ---
(In reply to Hans Petter Selasky from comment #36)
> Again, please fix the applications, to close the sound/mixer device upon 
> ioctl/read/write failure.

This needs to be done, of course, but I think avg@'s suggestion in comment #11
is also reasonable; the kernel shouldn't be at the mercy of a buggy
application.

> The problem is that the application, in this case a desktop application will 
> stop working, because it will never detect that the mixer device is gone.

That is in effect already the case though, the system does not operate
correctly until the offending application is terminated and restarted anyhow.

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