* Re: [alsa-devel] [RFC] revoke(2) and generic handling of things like remove_proc_entry()
@ 2013-04-08 13:16 Clemens Ladisch
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From: Clemens Ladisch @ 2013-04-08 13:16 UTC (permalink / raw)
To: Al Viro
Cc: linux-kernel, Linus Torvalds, Greg Kroah-Hartman, Rik van Riel,
Andrew Morton, Alexey Dobriyan, Takashi Iwai, linux-fsdevel,
alsa-devel
Al Viro wrote:
> BTW, snd_card_disconnect() doesn't do anything to existing mappings; smells
> like a bug, and there we do have ones with non-trivial ->mmap(). Could
> ALSA folks comment?
I don't know of any hotplug sound driver that maps memory from a device.
All hotplug buses (PCIe, USB, FireWire) involve DMAing from/to main
memory.
When a sound device is unplugged, sample transfers just stop, but the
buffer itself stays as long as the device node is kept opened. (In the
case of a capture device, that actually makes sense.)
Regards,
Clemens
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2013-04-08 13:16 [alsa-devel] [RFC] revoke(2) and generic handling of things like remove_proc_entry() Clemens Ladisch
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