From: Clemens Ladisch <clemens@ladisch.de>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Rik van Riel <riel@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Alexey Dobriyan <adobriyan@gmail.com>,
Takashi Iwai <tiwai@suse.de>,
linux-fsdevel@vger.kernel.org, alsa-devel@alsa-project.org
Subject: Re: [alsa-devel] [RFC] revoke(2) and generic handling of things like remove_proc_entry()
Date: Mon, 08 Apr 2013 15:16:10 +0200 [thread overview]
Message-ID: <5162C31A.6040209@ladisch.de> (raw)
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
reply other threads:[~2013-04-08 13:16 UTC|newest]
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