forked from Minki/linux
382225e62b
When a USB audio device is disconnected, snd_usb_audio_disconnect()
kills all audio URBs. At the same time, the application, after being
notified of the disconnection, might close the device, in which case
ALSA calls the .hw_free callback, which should free the URBs too.
Commit de1b8b93a0 "[ALSA] Fix hang-up at disconnection of usb-audio"
prevented snd_usb_hw_free() from freeing the URBs to avoid a hang that
resulted from this race, but this introduced another race because the
URB callbacks could now be executed after snd_usb_hw_free() has
returned, and try to access already freed data.
Fix the first race by introducing a mutex to serialize the disconnect
callback and all PCM callbacks that manage URBs (hw_free and hw_params).
Reported-and-tested-by: Pierre-Louis Bossart <pierre-louis.bossart@intel.com>
Cc: <stable@kernel.org>
[CL: also serialize hw_params callback]
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
#ifndef __USBAUDIO_H
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#define __USBAUDIO_H
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/*
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* (Tentative) USB Audio Driver for ALSA
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*
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* Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* handling of USB vendor/product ID pairs as 32-bit numbers */
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#define USB_ID(vendor, product) (((vendor) << 16) | (product))
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#define USB_ID_VENDOR(id) ((id) >> 16)
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#define USB_ID_PRODUCT(id) ((u16)(id))
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/*
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*
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*/
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struct snd_usb_audio {
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int index;
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struct usb_device *dev;
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struct snd_card *card;
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u32 usb_id;
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int shutdown;
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struct mutex shutdown_mutex;
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unsigned int txfr_quirk:1; /* Subframe boundaries on transfers */
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int num_interfaces;
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int num_suspended_intf;
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struct list_head pcm_list; /* list of pcm streams */
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int pcm_devs;
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struct list_head midi_list; /* list of midi interfaces */
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struct list_head mixer_list; /* list of mixer interfaces */
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int setup; /* from the 'device_setup' module param */
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int nrpacks; /* from the 'nrpacks' module param */
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int async_unlink; /* from the 'async_unlink' module param */
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struct usb_host_interface *ctrl_intf; /* the audio control interface */
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};
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/*
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* Information about devices with broken descriptors
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*/
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/* special values for .ifnum */
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#define QUIRK_NO_INTERFACE -2
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#define QUIRK_ANY_INTERFACE -1
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enum quirk_type {
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QUIRK_IGNORE_INTERFACE,
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QUIRK_COMPOSITE,
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QUIRK_MIDI_STANDARD_INTERFACE,
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QUIRK_MIDI_FIXED_ENDPOINT,
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QUIRK_MIDI_YAMAHA,
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QUIRK_MIDI_MIDIMAN,
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QUIRK_MIDI_NOVATION,
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QUIRK_MIDI_RAW_BYTES,
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QUIRK_MIDI_EMAGIC,
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QUIRK_MIDI_CME,
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QUIRK_MIDI_AKAI,
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QUIRK_MIDI_US122L,
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QUIRK_AUDIO_STANDARD_INTERFACE,
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QUIRK_AUDIO_FIXED_ENDPOINT,
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QUIRK_AUDIO_EDIROL_UAXX,
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QUIRK_AUDIO_ALIGN_TRANSFER,
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QUIRK_TYPE_COUNT
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};
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struct snd_usb_audio_quirk {
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const char *vendor_name;
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const char *product_name;
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int16_t ifnum;
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uint16_t type;
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const void *data;
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};
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#define combine_word(s) ((*(s)) | ((unsigned int)(s)[1] << 8))
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#define combine_triple(s) (combine_word(s) | ((unsigned int)(s)[2] << 16))
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#define combine_quad(s) (combine_triple(s) | ((unsigned int)(s)[3] << 24))
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#endif /* __USBAUDIO_H */
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