kernel/linux.git/sound/usb/proc.c, branch v7.0.10

ALSA: usb-audio: Replace manual mutex/spinlock with guard()

2025-08-12T06:36:17+00:00

This is another code cleanup by replacing the manual mutex or spinlock with guard() macros. usb_audio_disconnect() is slightly refactored (split to another function) to apply guard() cleanly, but the rest are rather straightforward conversions. No functional changes but only code refactoring. Link: https://patch.msgid.link/20250811082019.31052-1-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: usb-audio: Copy string more safely

2025-07-11T07:53:36+00:00

Replace strcpy() and sprintf() usages in the USB audio drivers with the safer versions (strscpy() and scnprintf()) with the proper max size evaluation. Only for safety, no actual behavior change. Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/20250710100727.22653-103-tiwai@suse.de

ALSA: usb-audio: Show sync endpoint information in proc outputs

2020-11-23T14:16:45+00:00

Now the sync endpoints have been parsed at the beginning and won't be changed dynamically, let's show them in the proc outputs for helping debugging. Tested-by: Keith Milner Tested-by: Dylan Robinson Link: https://lore.kernel.org/r/20201123085347.19667-36-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: usb-audio: Drop unneeded snd_usb_substream fields

2020-11-23T14:16:04+00:00

Some fields like interface and alt_idx in snd_usb_substream are mostly useless now as they can be referred via either cur_audiofmt or data_endpoint assigned to the substream. Drop those, and also assure the concurrency about the access of cur_audiofmt field. Tested-by: Keith Milner Tested-by: Dylan Robinson Link: https://lore.kernel.org/r/20201123085347.19667-31-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: usb-audio: Fix a limit check in proc_dump_substream_formats()

2020-04-22T09:29:15+00:00

This should be ARRAY_SIZE() instead of sizeof(). The sizeof() limit is too high so it doesn't work. Fixes: 093b8494f299 ("ALSA: usb-audio: Print more information in stream proc files") Signed-off-by: Dan Carpenter Link: https://lore.kernel.org/r/20200422092255.GB195357@mwanda Signed-off-by: Takashi Iwai

ALSA: usb-audio: Print more information in stream proc files

2020-04-19T22:22:04+00:00

For more debug and usability information, add the entry showing the DSD raw states and the channel mapping in each stream proc file. Link: https://lore.kernel.org/r/20200419212134.14200-1-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: usb-audio: Use pcm_for_each_format() macro for PCM format iterations

2020-02-10T07:27:19+00:00

The new macro can fix the sparse warnings gracefully: sound/usb/proc.c:73:31: warning: restricted snd_pcm_format_t degrades to integer sound/usb/proc.c:73:38: warning: restricted snd_pcm_format_t degrades to integer sound/usb/proc.c:73:61: warning: restricted snd_pcm_format_t degrades to integer No functional changes, just sparse warning fixes. Link: https://lore.kernel.org/r/20200206163945.6797-4-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: usb-audio: More constifications

2020-01-05T15:14:34+00:00

Apply const prefix to the remaining places: the static table for the unit information, the mixer maps, the validator tables, etc. Just for minor optimization and no functional changes. Link: https://lore.kernel.org/r/20200105144823.29547-12-tiwai@suse.de Signed-off-by: Takashi Iwai

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156

2019-05-30T18:26:35+00:00

Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Richard Fontana Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman

ALSA: usb-audio: Expose sample resolution through proc interface

2019-02-18T08:36:09+00:00

At least some USB devices use (MSB-aligned) audio format larger than the actual resolution of the device. In order to expose the actual device resolution (bBitResolution), add extra field to the procfs stream info interface. Signed-off-by: Jussi Laako Signed-off-by: Takashi Iwai