Some users reported the kernel WARNING with stack traces from hdmi_pcm_close(), and it's the line checking the per_cvt->assigned flag. This used to be a valid check in the past because the flag was turned on/off only at opening and closing a PCM stream. Meanwhile, since the introduction of the silent-stream mode, this flag may be turned on/off at the monitor connection/disconnection time, which isn't always associated with the PCM open/close. Hence this may lead to the inconsistent per_cvt->assigned flag at closing.

As the check itself became almost useless and confuses users as if it were a serious problem, just drop the check.

Fixes: b1a5039759cb ("ALSA: hda/hdmi: fix silent stream for first playback to DP") Cc: stable@vger.kernel.org BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=210987 Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/pci/hda/patch_hdmi.c | 1 - 1 file changed, 1 deletion(-)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index 97adff0cbcab..e405be7929e3 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -2130,7 +2130,6 @@ static int hdmi_pcm_close(struct hda_pcm_stream *hinfo, goto unlock; } per_cvt = get_cvt(spec, cvt_idx); - snd_BUG_ON(!per_cvt->assigned); per_cvt->assigned = 0; hinfo->nid = 0;