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ALSA: usx2y: Use snd_card_free_when_closed() at disconnection

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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.

Fixes: 230cd5e248 ("[ALSA] prevent oops & dead keyboard on usb unplugging while the device is be ing used")
Reported-by: syzbot+73582d08864d8268b6fd@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=73582d08864d8268b6fd
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20241113111042.15058-2-tiwai@suse.de
This commit is contained in:
Takashi Iwai
2024-11-13 12:10:35 +01:00
parent f69c2861b0
commit dafb28f02b
1 changed files with 1 additions and 1 deletions
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2
sound/usb/usx2y/usbusx2y.c
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@@ -422,7 +422,7 @@ static void snd_usx2y_disconnect(struct usb_interface *intf)
}
if (usx2y->us428ctls_sharedmem)
wake_up(&usx2y->us428ctls_wait_queue_head);
snd_card_free(card);
snd_card_free_when_closed(card);
}
static int snd_usx2y_probe(struct usb_interface *intf,