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>
99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
#ifndef __USBAUDIO_H
|
|
#define __USBAUDIO_H
|
|
/*
|
|
* (Tentative) USB Audio Driver for ALSA
|
|
*
|
|
* Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
|
|
*
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
/* handling of USB vendor/product ID pairs as 32-bit numbers */
|
|
#define USB_ID(vendor, product) (((vendor) << 16) | (product))
|
|
#define USB_ID_VENDOR(id) ((id) >> 16)
|
|
#define USB_ID_PRODUCT(id) ((u16)(id))
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
struct snd_usb_audio {
|
|
int index;
|
|
struct usb_device *dev;
|
|
struct snd_card *card;
|
|
u32 usb_id;
|
|
int shutdown;
|
|
struct mutex shutdown_mutex;
|
|
unsigned int txfr_quirk:1; /* Subframe boundaries on transfers */
|
|
int num_interfaces;
|
|
int num_suspended_intf;
|
|
|
|
struct list_head pcm_list; /* list of pcm streams */
|
|
int pcm_devs;
|
|
|
|
struct list_head midi_list; /* list of midi interfaces */
|
|
|
|
struct list_head mixer_list; /* list of mixer interfaces */
|
|
|
|
int setup; /* from the 'device_setup' module param */
|
|
int nrpacks; /* from the 'nrpacks' module param */
|
|
int async_unlink; /* from the 'async_unlink' module param */
|
|
|
|
struct usb_host_interface *ctrl_intf; /* the audio control interface */
|
|
};
|
|
|
|
/*
|
|
* Information about devices with broken descriptors
|
|
*/
|
|
|
|
/* special values for .ifnum */
|
|
#define QUIRK_NO_INTERFACE -2
|
|
#define QUIRK_ANY_INTERFACE -1
|
|
|
|
enum quirk_type {
|
|
QUIRK_IGNORE_INTERFACE,
|
|
QUIRK_COMPOSITE,
|
|
QUIRK_MIDI_STANDARD_INTERFACE,
|
|
QUIRK_MIDI_FIXED_ENDPOINT,
|
|
QUIRK_MIDI_YAMAHA,
|
|
QUIRK_MIDI_MIDIMAN,
|
|
QUIRK_MIDI_NOVATION,
|
|
QUIRK_MIDI_RAW_BYTES,
|
|
QUIRK_MIDI_EMAGIC,
|
|
QUIRK_MIDI_CME,
|
|
QUIRK_MIDI_AKAI,
|
|
QUIRK_MIDI_US122L,
|
|
QUIRK_AUDIO_STANDARD_INTERFACE,
|
|
QUIRK_AUDIO_FIXED_ENDPOINT,
|
|
QUIRK_AUDIO_EDIROL_UAXX,
|
|
QUIRK_AUDIO_ALIGN_TRANSFER,
|
|
|
|
QUIRK_TYPE_COUNT
|
|
};
|
|
|
|
struct snd_usb_audio_quirk {
|
|
const char *vendor_name;
|
|
const char *product_name;
|
|
int16_t ifnum;
|
|
uint16_t type;
|
|
const void *data;
|
|
};
|
|
|
|
#define combine_word(s) ((*(s)) | ((unsigned int)(s)[1] << 8))
|
|
#define combine_triple(s) (combine_word(s) | ((unsigned int)(s)[2] << 16))
|
|
#define combine_quad(s) (combine_triple(s) | ((unsigned int)(s)[3] << 24))
|
|
|
|
#endif /* __USBAUDIO_H */
|