When CONFIG_SND_DYNAMIC_MINORS isn't set, there are only limited number of devices available, and HD-audio, especially with HDMI/DP codec, will fail to create more than two devices.

The driver warns about the lack of such devices and skips the PCM device creations, but the HDMI driver still tries to create the corresponding JACK, SPDIF and ELD controls even for the non-existing PCM substreams. This results in confusion on user-space, and even may break the operation.

Similarly, Intel HDMI/DP codec builds the ELD notification from i915 graphics driver, and this may be broken if a notification is sent for the non-existing PCM stream.

This patch adds the check of the existence of the assigned PCM substream in the both scenarios above, and skips the further operation if the PCM substream is not assigned.

Fixes: 9152085defb6 ("ALSA: hda - add DP MST audio support") Cc: stable@vger.kernel.org Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/pci/hda/patch_hdmi.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index b4f1b6e88305..7d7eb1354eee 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -1383,6 +1383,8 @@ static void hdmi_pcm_setup_pin(struct hdmi_spec *spec, pcm = get_pcm_rec(spec, per_pin->pcm_idx); else return; + if (!pcm->pcm) + return; if (!test_bit(per_pin->pcm_idx, &spec->pcm_in_use)) return;

@@ -2151,8 +2153,13 @@ static int generic_hdmi_build_controls(struct hda_codec *codec) int dev, err; int pin_idx, pcm_idx;

- for (pcm_idx = 0; pcm_idx < spec->pcm_used; pcm_idx++) { + if (!get_pcm_rec(spec, pcm_idx)->pcm) { + /* no PCM: mark this for skipping permanently */ + set_bit(pcm_idx, &spec->pcm_bitmap); + continue; + } + err = generic_hdmi_build_jack(codec, pcm_idx); if (err < 0) return err;