From: Takashi Iwai Date: Wed, 13 Nov 2024 11:10:35 +0000 (+0100) Subject: ALSA: usx2y: Use snd_card_free_when_closed() at disconnection X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=dafb28f02be407e07a6f679e922a626592b481b0;p=users%2Fjedix%2Flinux-maple.git ALSA: usx2y: Use snd_card_free_when_closed() at disconnection 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: 230cd5e24853 ("[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 Link: https://patch.msgid.link/20241113111042.15058-2-tiwai@suse.de --- diff --git a/sound/usb/usx2y/usbusx2y.c b/sound/usb/usx2y/usbusx2y.c index 2f9cede242b3..5f81c68fd42b 100644 --- a/sound/usb/usx2y/usbusx2y.c +++ b/sound/usb/usx2y/usbusx2y.c @@ -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,