The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
ead3d3c5b54f ("ALSA: hda: Fix hang at HD-audio codec unbinding due to refcount saturation") 37c4fd0db7c9 ("ALSA: hda: Do disconnect jacks at codec unbind") 7206998f578d ("ALSA: hda: Fix potential deadlock at codec unbinding")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From ead3d3c5b54f76da79c079e61bacb4279ec56965 Mon Sep 17 00:00:00 2001 From: Takashi Iwai tiwai@suse.de Date: Sat, 10 Sep 2022 16:25:50 +0200 Subject: [PATCH] ALSA: hda: Fix hang at HD-audio codec unbinding due to refcount saturation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
We fixed the potential deadlock at dynamic unbinding the HD-audio codec at the commit 7206998f578d ("ALSA: hda: Fix potential deadlock at codec unbinding"), but ironically, this caused another potential deadlock. The current code uses refcount_dec() and waits for the pending task with wait_event for dropping the refcount to 0. This works fine when PCMs are assigned and actually waiting for the refcount drop.
Meanwhile, when there was no PCM assigned, the refcount_dec() call itself was supposed to drop to zero -- alas, it doesn't in reality; refcount_dec() complains, spews kernel warning and it saturates instead of dropping to 0, due to the nature of refcount_dec() implementation. This eventually blocks the wait_event() wakeup and the code get stuck there.
For avoiding the problem, we call refcount_dec_and_test() and skips the sync-wait if it already reaches to zero.
The patch does a slight code reshuffling to make sure to invoke other disconnect calls before the sync-wait, too.
Fixes: 7206998f578d ("ALSA: hda: Fix potential deadlock at codec unbinding") Reported-by: Ville Syrjälä ville.syrjala@linux.intel.com Tested-by: Ville Syrjälä ville.syrjala@linux.intel.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/YxtflWQnslMHVlU7@intel.com Link: https://lore.kernel.org/r/20220910142550.28494-1-tiwai@suse.de Signed-off-by: Takashi Iwai tiwai@suse.de
diff --git a/sound/pci/hda/hda_bind.c b/sound/pci/hda/hda_bind.c index cae9a975cbcc..1a868dd9dc4b 100644 --- a/sound/pci/hda/hda_bind.c +++ b/sound/pci/hda/hda_bind.c @@ -157,10 +157,10 @@ static int hda_codec_driver_remove(struct device *dev) return codec->bus->core.ext_ops->hdev_detach(&codec->core); }
- refcount_dec(&codec->pcm_ref); snd_hda_codec_disconnect_pcms(codec); snd_hda_jack_tbl_disconnect(codec); - wait_event(codec->remove_sleep, !refcount_read(&codec->pcm_ref)); + if (!refcount_dec_and_test(&codec->pcm_ref)) + wait_event(codec->remove_sleep, !refcount_read(&codec->pcm_ref)); snd_power_sync_ref(codec->bus->card);
if (codec->patch_ops.free)