On Fri, 17 Nov 2017 09:28:55 +0100,
VDR User wrote:
>
> Hi Takashi,
>
> I can confirm that your patch does fix the bug:
>
> [ao/alsa] trying to set ALSA channel map: FL FR FC LFE RL RR
> [ao/alsa] channel map reported by ALSA: FL FR FC LFE RL RR
> [ao/alsa] which we understand as: 5.1
>
> /usr/src/linux$ uname -r
> 4.14.0-amd
> /usr/src/linux$ speaker-test -c 6 -t wav
>
> speaker-test 1.1.3
>
> Playback device is default
> Stream parameters are 48000Hz, S16_LE, 6 channels
> WAV file(s)
> Rate set to 48000Hz (requested 48000Hz)
> Buffer size range from 64 to 5440
> Period size range from 32 to 2720
> Using max buffer size 5440
> Periods = 4
> was set period_size = 1088
> was set buffer_size = 5440
> 0 - Front Left
> 4 - Front Center
> 1 - Front Right
> 3 - Rear Right
> 2 - Rear Left
> 5 - LFE
> Time per period = 8.525875
>
> Thank you for all your help to resolve this bug!
Great, thanks for your patient testing!
FWIW, below is the patch I'm going to queue.
Takashi
-- 8< --
From: Takashi Iwai <tiwai@xxxxxxx>
Subject: [PATCH] ALSA: hda: Fix too short HDMI/DP chmap reporting
We got a regression report about the HD-audio HDMI chmap, where some
surround channels are reported as UNKNOWN. The git bisection pointed
the culprit at the commit 9b3dc8aa3fb1 ("ALSA: hda - Register chmap
obj as priv data instead of codec"). The story behind scene is like
this:
- While moving the code out of the legacy HDA to the HDA common place,
the patch modifies the code to obtain the chmap array indirectly in
a byte array, and it expands it to kctl value array.
- At the latter operation, the size of the array is wrongly passed by
sizeof() to the pointer.
- It can be 4 on 32bit arch, thus too short for 6+ channels.
(And that's the reason why it didn't hit other persons; it's 8 on
64bit arch, thus it's usually enough.)
The code was further changed meanwhile, but the problem persisted.
Let's fix it by correctly evaluating the array size.
Fixes: 9b3dc8aa3fb1 ("ALSA: hda - Register chmap obj as priv data instead of codec")
Reported-by: VDR User <user.vdr@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
sound/hda/hdmi_chmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/hda/hdmi_chmap.c b/sound/hda/hdmi_chmap.c
index 81acc20c2535..f21633cd9b38 100644
--- a/sound/hda/hdmi_chmap.c
+++ b/sound/hda/hdmi_chmap.c
@@ -746,7 +746,7 @@ static int hdmi_chmap_ctl_get(struct snd_kcontrol *kcontrol,
memset(pcm_chmap, 0, sizeof(pcm_chmap));
chmap->ops.get_chmap(chmap->hdac, pcm_idx, pcm_chmap);
- for (i = 0; i < sizeof(chmap); i++)
+ for (i = 0; i < ARRAY_SIZE(pcm_chmap); i++)
ucontrol->value.integer.value[i] = pcm_chmap[i];
return 0;
--
2.15.0
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