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linux-stable/sound/usb/caiaq
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Takashi Iwai 237f3faf01 ALSA: caiaq: Use snd_card_free_when_closed() at disconnection 
[ Upstream commit b04dcbb7f7 ]

The USB disconnect callback is supposed to be short and not too-long
waiting.  OTOH, the current code uses snd_card_free() at
disconnection, but this waits for the close of all used fds, hence it
can take long.  It eventually blocks the upper layer USB ioctls, which
may trigger a soft lockup.

An easy workaround is to replace snd_card_free() with
snd_card_free_when_closed().  This variant returns immediately while
the release of resources is done asynchronously by the card device
release at the last close.

This patch also splits the code to the disconnect and the free phases;
the former is called immediately at the USB disconnect callback while
the latter is called from the card destructor.

Fixes: 523f1dce37 ("[ALSA] Add Native Instrument usb audio device support")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20241113111042.15058-5-tiwai@suse.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-12-14 19:53:34 +01:00
..
audio.c ALSA: caiaq: Use snd_card_free_when_closed() at disconnection 2024-12-14 19:53:34 +01:00
audio.h ALSA: caiaq: Use snd_card_free_when_closed() at disconnection 2024-12-14 19:53:34 +01:00
control.c ALSA: caiaq: More constifications 2020-01-05 16:14:37 +01:00
control.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
device.c ALSA: caiaq: Use snd_card_free_when_closed() at disconnection 2024-12-14 19:53:34 +01:00
device.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
input.c ALSA: caiaq: Use snd_card_free_when_closed() at disconnection 2024-12-14 19:53:34 +01:00
input.h ALSA: caiaq: Use snd_card_free_when_closed() at disconnection 2024-12-14 19:53:34 +01:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
midi.c ALSA: Convert strlcpy to strscpy when return value is unused 2021-01-08 09:30:05 +01:00
midi.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00